Consider that the content is dynamic and can change in amount based upon several things and why a fluid layout is preferable...
But to insert this image: find this in your css
Code:
.centerColumn, #bannerOne, #bannerTwo, #bannerThree, #bannerFour, #bannerFive, #bannerSix {
padding: 0.8em;
}
and change to this
Code:
.centerColumn {
background-image: url(../images/main_page/testbox.gif);
background-repeat: none;
border: 1px solid;
border-color: #000000;
margin: 3em;
padding: 0.8em;
}
#bannerOne, #bannerTwo, #bannerThree, #bannerFour, #bannerFive, #bannerSix {
padding: 0.8em;
}
Adjust the margins & padding to acheive the placement that you want, you can also use/add margin-left or right or top & bottom for more precise placement
Then enter this in the admin > tools > define page editor > main_page.php file
Code:
<img src="includes/templates/gloss_blue/images/main_page/box1.gif">
<img src="includes/templates/demo/images/welcome.png">
<img src="includes/templates/gloss_blue/images/main_page/summerspecials.gif">
<img src="includes/templates/gloss_blue/images/main_page/exdemo.gif">
<img src="includes/templates/gloss_blue/images/main_page/contact.gif">
Add styling...or use the html editor and the place image function
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