Ok, so I resized the #headerWrapper to fit the #mainWrapper which did wonders for my alignment. Thanks a lot. However, this did not fix the issue.

There must be some reason that Mozilla is overlapping my background image. It works perfectly in IE, but in Mozilla it looks choppy and cheap.

Anyone got any other ideas?

Here is the modified code:
HTML Code:
/**
 * Acadame CSS Stylesheet
 *
 * @package templateSystem
 * @copyright Copyright 2007 iChoze Internet Solutions
 * @copyright Copyright 2003-2006 Zen Cart Development Team
 * @copyright Portions Copyright 2003 osCommerce
 * @license http://www.zen-cart.com/license/2_0.txt GNU Public License V2.0
 * @version $Id: stylesheet.css 5349 2006-12-22 20:34:40Z birdbrain $
 */

body {
	margin: 0;
	padding: 0;
	border: none;
	font-family: verdana, arial, helvetica, sans-serif;
	font-size: 62.5%;
	color: #000000;
    background-image: url(../images/jujubg.png);
	background-repeat: repeat-x;
	background-attachment:fixed;
	}

a img {border: none; }

a:link, #navEZPagesTOC ul li a {
	color: #D42C00;
	text-decoration: none;
	}
 
a:visited {
	color: #D42C00;
	text-decoration: none;
	}

a:hover, #navEZPagesTOC ul li a:hover, #navMain ul li a:hover, #navCatTabs ul li a:hover {
	color: #D42C00;
	text-decoration: underline;
	}
#navSupp ul li a:hover {
 	color:#D42C00;
	text-decoration: underline;
}

a:active {
	color: #0000FF;
	}

h1 {
	font-size: 1.5em;
	color: #D42C00;
	}

h2 {
	font-size: 1.4em;
	}

h3 {
	font-size: 1.3em;
	}

h4, h5, h6, LABEL, h4.optionName, LEGEND, ADDRESS, .sideBoxContent, .larger{
	font-size: 1.1em;
	}

.biggerText {
	font-size: 1.2em;
	}

h1, h2, h3, h4, h5, h6 {
	margin: 0.3em 0;
	}

/*  Might uncomment either or both of these if having problems with IE peekaboo bug:
h1, h2, h3, h4, h5, h6, p {
	position: relative;
	}
*html .centerColumn {
	height: 1%;
	}
*/

CODE {
	font-family: arial, verdana, helvetica, sans-serif;
	font-size: 1em;
	}

FORM, SELECT, INPUT {
	display: inline;
	font-size: 1em;
	margin: 0.1em;
	}

TEXTAREA {
	float: left;
	margin: auto;
	display: block;
	width: 95%;
	}

input:focus, select:focus, textarea:focus {
	background: #E4FEF5;
	}

FIELDSET {
	padding: 0.5em;
	margin: 0.5em 0em;
	border: 1px solid #cccccc;
	}

LEGEND {
	font-weight: bold;
	padding: 0.3em;
	}

LABEL, h4.optionName {
	line-height: 1.5em;
	padding: 0.2em;
	}

LABEL.checkboxLabel, LABEL.radioButtonLabel {
	margin: 0.5em 0.3em;
	}

#logo, .centerBoxContents, .specialsListBoxContents, .categoryListBoxContents, .centerBoxContentsAlsoPurch, .attribImg {
	float: left;
	}

LABEL.inputLabel {
	width: 9em;
	float: left;
	}

LABEL.inputLabelPayment {
	width: 14em;
	float: left;
	padding-left: 2.5em;
	}

LABEL.selectLabel, LABEL.switchedLabel, LABEL.uploadsLabel {
	width: 11em;
	float: left;
	}

#checkoutPayment LABEL.radioButtonLabel {
	font-weight: bold;
	}

P, ADDRESS {
	padding: 0.5em;
	}

ADDRESS {
	font-style: normal;
	}

.clearBoth {
	clear: both;
	}

HR {
	height: 1px;
	margin-top: 0.5em;
	border: none;
	border-bottom: 1px solid #9a9a9a;
	}

/*warnings, errors, messages*/
.messageStackWarning, .messageStackError, .messageStackSuccess, .messageStackCaution {
	line-height: 1.8em;
	padding: 0.2em;
	border: 1px solid #9a9a9a;
	}

.messageStackWarning, .messageStackError {
	background-color: #ff0000;
	color: #ffffff;
	}

.messageStackSuccess {
	background-color: #99FF99;
	color: #000000;
	}

.messageStackCaution {
	background-color: #FFFF66;
	color: #000000;
	}

/*wrappers - page or section containers*/
#mainWrapper {
	background-color: #ffffff;
	text-align: left;
	width: 900px;
	vertical-align: top;
	}

#cartBoxListWrapper, #ezPageBoxList, #cartBoxListWrapper ul, #ezPageBoxList ul, #mainWrapper, #popupAdditionalImage, #popupImage {
	margin: 0em;
	padding: 0em;
	}
#contentMainWrapper {
	margin:0em 0;
	padding:0;
	}
#headerWrapper{
	margin: 0 auto;
	padding: 0em;
	width: 900px;
	}

#topBar{
        margin-left: auto; 
        margin-right: auto;
        background-repeat: no-repeat;
        width:918px;
		height:52px;
        color:#ffffff;
        font-weight:bold;
        padding: 0em;
		border: 0em;
		
	}
	
	#topBarWrap{
	height:52px;
	background:#FF5A00 url(../images/topbg.gif) no-repeat center center;
	background-size:100%;
	background-position:center;
	color:#ffffff;
	padding:0em;
	border:0em;
	margin:0em;
	horizontal-position:center;
	}
.topBox{
	float:center;
	padding: 0em;
	height:3em;
	}
#lang_header{
	border-right:1px solid #9a9a9a;
	padding-left:12em;
	}
#currency_header{
	border-right:1px solid #9a9a9a;
	}
#cart_header{
	background:url(../images/cart_bg.gif) 5em 0 no-repeat;
	padding:.2em 0 0 11em;
	}
#logoWrap{
	margin:auto;
	background-color: #ffffff;
	height:100px;
	width:900px;
	border-bottom:em solid #EEEEEE;
	}
#topLinks{
	float:right;
	background:#ffffff;
	margin: .9em auto;
	width:74%;
	}
#navColumnOneWrapper, #navColumnTwoWrapper, #mainWrapper {
	margin: auto;
	} 
#navColumnOneWrapper, #navColumnTwoWrapper {
	}
	
#tagline {
	color:#000000;
	font-size: 2em;
	text-align : center;
	vertical-align: middle;
	}

#sendSpendWrapper {
	border: 1px solid #cacaca;
	float: right;
	margin: 0em 0em 1em 1em;
	}

.floatingBox, #accountLinksWrapper, #sendSpendWrapper, #checkoutShipto, #checkoutBillto, #navEZPagesTOCWrapper {
	margin: 0;
	width: 47%;
	}

.wrapperAttribsOptions {
	margin: 0.3em 0em;
	}

/*navigation*/
.topsellerlinks {
font-size: 1.1em
}

.navSplitPagesResult {}
.navSplitPagesLinks {}

.navNextPrevCounter {
	margin: 0em;
	font-size: 0.9em;
	}
.navNextPrevList {
	display: inline;
	white-space: nowrap;
	margin: 0;
	padding: 0.5em 0em;
	list-style-type: none;
	}

#navSuppWrapper, #navCatTabsWrapper {
	margin: 0em;
	background-color: #2E2E2E;
	padding: 0.5em 0.2em;
	font-weight: bold;
	color: #909090;
	border-top:5px solid #000000;
	height: 1%;
	}
#navSupp{
	width:750px;
	margin:auto;
}
#paymentsWrap{
	margin:auto;
	width:50%;
	}
#payments{
	float:center;
	background:url(../images/discountgifts.gif) 5em 1em no-repeat;
	width:277px;
	height:62px;
	padding:1em 0 0 18em;
	}
#bottomNav{
	margin:auto;
	}
#bottomNav a, #bottomNav a:visited{
	color:#9a9a9a;
	text-decoration:underline;
	}

#navCatTabsWrapper {
	background-color: #ffffff;
	color: #9a9a9a;
	background-image:none;
}

#navMain ul, #navSupp ul, #navCatTabs ul {
	margin: 0;
	padding: 0.5em 0em;
	list-style-type: none;
	text-align: center;
	line-height: 1.5em;
	}

#navMain ul li, #navSupp ul li, #navCatTabs ul li {
	display: inline;
	}

#navMain ul li a, #navSupp ul li a, #navSupp ul li a:visited, #navCatTabs ul li a {
	text-decoration: none;
	padding: 0em 0.5em;
	margin: 0;
	color: #EEEEEE;
	white-space: nowrap;
	}
#navSupp ul li a:hover {
	color:#EEEEEE;
	text-decoration:underline;
	}

#navCatTabs ul li a {
	color: #9a9a9a;
	}

#navEZPagesTOCWrapper {
	font-weight: bold;
	float: right;
	height: 1%;
	border: 1px solid #9a9a9a;
	}

#navEZPagesTOC ul {
	margin: 0;
	padding: 0.5em 0em;
	list-style-type: none;
	line-height: 1.5em;
	}

#navEZPagesTOC ul li {
	white-space: nowrap;
	}

#navEZPagesTOC ul li a {
	padding: 0em 0.5em;
	margin: 0;
	}

#navCategoryIcon, .buttonRow, #indexProductListCatDescription {
	margin: 0.5em;
	}

#navMainSearch {
	float: right;
	}

#navBreadCrumb {
	padding: 0.5em 0.5em;
	font-size: 0.95em;
	font-weight: bold;
	margin: 0em;
	}

#navEZPagesTop {
	font-size: 0.95em;
	font-weight: bold;
	margin: 0;
	padding: 1.5em 0 1.7em .5em;
	color:#ffffff;
	}

#navEZPagesTop a:link, #navEZPagesTop a:visited{
	color:#ffffff;
	padding:0 1em 0 .8em;
	}
#navEZPagesTop a:hover{
	text-decoration:underline;
	}

#navColumnOne, #navColumnTwo {
	background-color: transparent;
	}

/*The main content classes*/
#contentColumnMain, #navColumnOne, #navColumnTwo, .centerBoxContents, .specialsListBoxContents, .categoryListBoxContents, .additionalImages, .centerBoxContentsSpecials, .centerBoxContentsAlsoPurch, .centerBoxContentsFeatured, .centerBoxContentsNew, .alert {
	vertical-align: top;
	}

/*.content,*/ #productDescription, .shippingEstimatorWrapper {
	/*font-size: 1.2em;*/
	padding: 0.5em;
	}

.alert {
	color: #FF0000;
	margin-left: 0.5em;
	}
.advisory {}
.important {
	font-weight: bold;
	}
.notice {}
.rating{}
.gvBal {
	float: right;
	}
.centerColumn {
	padding: 0.8em;
	}
#bannerTwo, #bannerThree, #bannerFour, #bannerFive, #bannerSix {
	padding: 0 0 0 .6em;
	}
#bannerOne{
	padding:0;
	margin: .5em 0 0 0;
	}
.banners img{
	padding:0;
	}
.centerColumn{
	padding-top:0;
}

.smallText, #siteinfoLegal, #siteinfoCredits, #siteinfoStatus, #siteinfoIP {
	font-size: 0.9em;
	}

/*Shopping Cart Display*/
#cartAdd {
	float: right;
	text-align: center;
	margin: 1em;
	border: 1px solid #000000;
	padding: 1em;
	}

.tableHeading TH {
	border-bottom: 1px solid #9a9a9a;
	}

.tableHeading, #cartSubTotal {
	background-color: #e9e9e9;
	 }

#cartSubTotal {
	border-top: 1px solid #cccccc;
	font-weight: bold;
	text-align: right;
	line-height: 2.2em;
	padding-right: 2.5em;
	}

.tableRow, .tableHeading, #cartSubTotal {
	height: 2.2em;
	}

.cartProductDisplay, .cartUnitDisplay, .cartTotalDisplay, .cartRemoveItemDisplay, .cartQuantityUpdate, .cartQuantity, #cartInstructionsDisplay, .cartTotalsDisplay {
	padding: 0.5em 0em;
	}

.cartUnitDisplay, .cartTotalDisplay {
	text-align: right;
	padding-right: 0.2em;
	}

#scUpdateQuantity {
	width: 2em;
	}

.cartQuantity {
	width: 4.7em;
	}

.cartNewItem {
	color: #33CC33;
	position: relative;  /*do not remove-fixes stupid IEbug*/
	}

.cartOldItem {
	color: #660099;
	position: relative;  /*do not remove-fixes stupid IEbug*/
	}

.cartBoxTotal {
	text-align: right;
	font-weight: bold;
	}

.cartRemoveItemDisplay {
	width: 3.5em;
	}

.cartAttribsList {
	margin-left: 1em;
	}

#mediaManager {
	width: 50%; 
	margin: 0.2em;
	padding: 0.5em;
	background-color: #E4FEf5;
	border: 1px solid #003D00;
	}

.normalprice, .productSpecialPriceSale {
	text-decoration: line-through;
	}

.productSpecialPrice, .productSalePrice, .productSpecialPriceSale, .productPriceDiscount {
	color: #ff0000;
	}

.orderHistList {
	margin: 1em;
	padding: 0.2em 0em;
	list-style-type: none;
	} 

#cartBoxListWrapper ul, #ezPageBoxList ul {
	list-style-type: none;
	}

#cartBoxListWrapper li, #ezPageBoxList li, .cartBoxTotal {
	margin: 0;
	padding: 0.2em 0em;
	} 

#cartBoxEmpty, #cartBoxVoucherBalance {
	font-weight: bold;
	}

.totalBox {
	width: 5.5em;
	text-align: right;
	padding: 0.2em;
	}

.lineTitle, .amount {
	text-align: right;
	padding: 0.2em;
	}

.amount {
	width: 5.5em;
	}

/*Image Display*/
#productMainImage, #reviewsInfoDefaultProductImage, #productReviewsDefaultProductImage, #reviewWriteMainImage {
	margin: 0em 1em 1em 0em ;
	}

.categoryIcon {}

#cartImage {
	margin: 0.5em 1em;
	}

/*Attributes*/
.attribImg {
	width: 20%;
	margin: 0.3em 0em;
}

.attributesComments {}

/*list box contents*/
.centerBoxContents, .specialsListBoxContents, .categoryListBoxContents, .additionalImages, .centerBoxContentsSpecials, .centerBoxContentsAlsoPurch, .centerBoxContentsFeatured, .centerBoxContentsNew {
	margin: 1em 0em;
	}

.centerBoxWrapper {
	border-left: 1px solid #9a9a9a;
	border-right: 1px solid #9a9a9a;
	border-bottom: 4px solid #9a9a9a;
	height: 1%;
	margin: 1.1em 0;
	}

h2.centerBoxHeading {
	font-size: 1.5em;
	color: #ffffff;
	}

/*sideboxes*/
.columnLeft {}

h3.leftBoxHeading, h3.leftBoxHeading a,
h3.rightBoxHeading, h3.rightBoxHeading a {
	font-size: 1.1em;
	color: #ffffff;
	}
#manufacturersHeading, #currenciesHeading, #musicgenresHeading, #recordcompaniesHeading, #searchHeading, #search-headerHeading {
	font-size: 0.9em;
	align: center;
	color: #ffffff;
}

.leftBoxHeading, .rightBoxHeading {
	margin: 0em;
	padding:.5em 0 .7em 1em;
	background:#DE5F03 url(../images/catboxHeadingbg.gif) repeat-x;
}
.centerBoxHeading{
	margin: 0em;
	padding:.3em 0 .4em 2em;
	background:#DE5F03 url(../images/centerboxHeadingbg.gif) repeat-x;
}
#categoriesHeading {
	background:#DE5F03 url(../images/centerboxHeadingbg.gif) repeat-x;
	font-size:1.5em;
	padding:.2em 0 .4em 1em;
	}
#whatsnewHeading {
	background:#DE5F03 url(../images/centerboxHeadingbg.gif) repeat-x;
	font-size:1.2em;
	padding:.4em 0 .5em 1em;
	}
#bestsellersHeading {
	background:#DE5F03 url(../images/centerboxHeadingbg.gif) repeat-x;
	font-size:1.3em;
	padding:.4em 0 .5em 1em;
	}
#categories ul{
	padding:0;
	margin:0;
	list-style:none;
	}
.category-top li{
	padding:0;
	margin:0;
	background: #EEEEEE;
	vertical-align:middle;
	}
li.category-top a{
	padding:.4em 0 0 1.5em;
	margin:0;
	color:#333333;
	font-weight:bold;
	display:block;
	height:1.8em;
	border-bottom:1px solid #9a9a9a;
	background:#EEEEEE url(../images/boxlistbg.png) .4em 0.5em no-repeat;
	}
li.category-products a{
	padding:.4em 0 0 1.5em;
	margin:0;
	color:#333333;
	font-weight:bold;
	display:block;
	height:1.8em;
	border-bottom:1px solid #9a9a9a;
	background:#EEEEEE url(../images/boxlistbg.png) 1.2em 0.5em no-repeat;
	}
li.category-top a:hover{
	background:#333333 url(../images/boxlistbg.png) .4em 0.5em no-repeat;
	color:#EEEEEE;
	}
li.category-products a:hover{
	background:#333333 url(../images/boxlistbg.png) 1.2em 0.5em no-repeat;
	color:#EEEEEE;
	}
#categoriesContent{
	padding:0;
	margin:0;
	}
#bestsellersContent {
	color:#333333;
	font-weight:bold;
	}
#informationContent a:link, #informationContent a:visited, #bestsellersContent, 
#bestsellersContent a:link, #bestsellersContent a:visited{
	color:#333333;
	font-weight:bold;
	}
#extralinks{
	padding: .5em 0 .5em 1em;
	}
.leftBoxContainer, .rightBoxContainer {
	margin: 0 0 1em 0;
	border-left: 1px solid #9a9a9a;
	border-right: 1px solid #9a9a9a;
	border-bottom: 4px solid #9a9a9a;
	}

.sideBoxContent {
	background-color: #ffffff;
	padding: 0.4em;
	}

h3.leftBoxHeading a:hover, h3.rightBoxHeading a:hover {
	color: #FFFF33;
	text-decoration: none;
	} 

.rightBoxHeading a:visited, .leftBoxHeading a:visited, .centerBoxHeading a:visited {
	color: #FFFFFF;
	}

.centeredContent, TH, #cartEmptyText, #cartBoxGVButton, #cartBoxEmpty, #cartBoxVoucherBalance, #navCatTabsWrapper, #navEZPageNextPrev, #bannerOne, #bannerTwo, #bannerThree, #bannerFour, #bannerFive, #bannerSix, #siteinfoLegal, #siteinfoCredits, #siteinfoStatus, #siteinfoIP, .center, .cartRemoveItemDisplay, .cartQuantityUpdate, .cartQuantity, .cartTotalsDisplay, #cartBoxGVBalance, .productListing-data, .accountQuantityDisplay, .ratingRow, LABEL#textAreaReviews, #productMainImage, #reviewsInfoDefaultProductImage, #productReviewsDefaultProductImage, #reviewWriteMainImage, .centerBoxContents, .specialsListBoxContents, .categoryListBoxContents, .additionalImages, .centerBoxContentsSpecials, .centerBoxContentsAlsoPurch, .centerBoxContentsFeatured, .centerBoxContentsNew, .gvBal, .attribImg {
	text-align: center;
	}

#bestsellers .wrapper {
	margin: 0em 0em 0em 1.5em;
	}

#bestsellers ol {
	padding: 0;
	margin-left: 1.1em;
	}

#bestsellers li {
	padding: 0;
	margin: 0.3em 0em 0.3em 0em;
	}
.ic{
	display:none;
	}
#bannerboxHeading {
	background-color: #0000CC;
}

#upProductsHeading {
	text-align: left;
	}

#upDateHeading {
	text-align: right;
	}

/* categories box parent and child categories */
A.category-top, A.category-top:visited {
	color: #008000;
	text-decoration: none;
	}
A.category-links, A.category-links:visited {
	color: #333333;
	font-weight:bold;
	}
A.category-subs, A.category-products, A.category-subs:visited, A.category-products:visited {
	color: #FF0000;
	text-decoration: none;
	}
SPAN.category-subs-parent {
	font-weight: bold;
	}
SPAN.category-subs-selected {
	font-weight: bold;
	}
/* end categories box links */

/*misc*/
.back {
	float: left;
	}

.forward, #shoppingCartDefault #PPECbutton {
	float: right;
	}

.bold {
	font-weight: bold;
	}

.rowOdd {
	background-color: #E8E8E8;
	height: 1.5em;
	vertical-align: top;
	}

.rowEven {
	background-color: #F0F0F0;
	height: 1.5em;
	vertical-align: top;
	}

.hiddenField {
	display: none;
}
.visibleField {
	display: inline;
}

CAPTION {
	/*display: none;*/
	}

#myAccountGen li, #myAccountNotify li {
	margin: 0;
	} 

.accountTotalDisplay, .accountTaxDisplay {
	width: 20%;
	text-align: right;
	/*vertical-align: top*/
	}

.accountQuantityDisplay {
	width: 10%;
	vertical-align: top
	}

TR.tableHeading {
	background-color: #cacaca;
	height: 2em;
	}

.productListing-rowheading {
	background-image: url(../images/centerBoxHeadingbg.gif);
	height: 2em;
	color: #FFFFFF;
	}

#siteMapList {
	width: 90%;
	float: right;
	}

.ratingRow {
	margin: 1em 0em 1.5em 0em;
	}

LABEL#textAreaReviews {
	font-weight: normal;
	margin: 1em 0em;
	}

#popupShippingEstimator, #popupSearchHelp, #popupAdditionalImage, #popupImage, #popupCVVHelp, #popupCouponHelp, #popupAtrribsQuantityPricesHelp, #infoShoppingCart {
	background-color: #ffffff;
	}

/***IMAGE HANDLER SUPPORT ***/

#trailimageid {
  position: absolute;
  visibility: hidden;
  left: 0px;
  top: 0px;
  width: 220px;
  height: 0px;
  z-index: 1000;
}

#trailimageid div {
  padding: 5px;
  background-color: #FFF;
  border: 1px solid #888;
  text-align: center;
}

#trailimageid h1 {
  font-size: 100%;
  font-weight: normal;
  margin: 0;
  padding: 2px 0px;
  text-align: left;
  width: 100%;
}

#trailimageid img {
  margin: 2px;
  border: none;
}

Thanks for the help guys.