(well thats weird that there ended up being smiley faces in the code, is there a way to post code so that doesn't happen?) Here is a pic of what firebug is telling me about this height property, which is not defined in the colorbox css as far as I can tell:



Here is the colorbox stylesheet:

/*
ColorBox Core Style:
The following CSS is consistent between example themes and should not be altered.
*/
#colorbox, #cboxOverlay, #cboxWrapper{position:absolute; top:0; left:0; z-index:9999; overflow:hidden;}
#cboxOverlay{position:fixed; width:100%; height:100%;}
#cboxMiddleLeft, #cboxBottomLeft{clear:left;}
#cboxContent{position:relative;}
#cboxLoadedContent{overflow:auto;}
#cboxTitle{margin:0;}
#cboxLoadingOverlay, #cboxLoadingGraphic{position:absolute; top:0; left:0; width:100%; height:100%;}
#cboxPrevious, #cboxNext, #cboxClose, #cboxSlideshow{cursorointer;}
.cboxPhoto{float:left; margin:auto; border:0; display:block; max-width:none;}
.cboxIframe{width:100%; height:100%; display:block; border:0;}
#colorbox, #cboxContent, #cboxLoadedContent{box-sizing:content-box; -moz-box-sizing:content-box; -webkit-box-sizing:content-box;}

/*
User Style:
Change the following styles to modify the appearance of ColorBox. They are
ordered & tabbed in a way that represents the nesting of the generated HTML.
*/
#cboxOverlay{background:#222222 url(../images/overlay.png) repeat 0 0;}
#colorbox{}
#cboxTopLeft{width:21px; height:21px; background:url(../images/controls.png) no-repeat -101px 0; display: none !important;}
#cboxTopRight{width:21px; height:21px; background:url(../images/controls.png) no-repeat -130px 0; display: none !important;}
#cboxBottomLeft{width:21px; height:21px; background:url(../images/controls.png) no-repeat -101px -29px; display: none !important;}
#cboxBottomRight{width:21px; height:21px; background:url(../images/controls.png) no-repeat -130px -29px; display: none !important;}
#cboxMiddleLeft{width:21px; background:url(../images/controls.png) left top repeat-y; display: none !important;}
#cboxMiddleRight{width:21px; background:url(../images/controls.png) right top repeat-y; display: none !important;}
#cboxTopCenter{height:21px; background:url(../images/border.png) 0 0 repeat-x; display: none !important;}
#cboxBottomCenter{height:21px; background:url(../images/border.png) 0 -29px repeat-x; display: none !important;}
#cboxContent{background:#fff; overflow:hidden;}
.cboxIframe{background:#fff;}
#cboxError{padding:50px; border:1px solid #ccc;}
#cboxLoadedContent{margin-bottom:28px;}
#cboxTitle{position:absolute; bottom:4px; left:0; text-align:center; width:100%; color:#949494;}
#cboxCurrent{position:absolute; bottom:10px; left:90px; color:#949494;}
#cboxSlideshow{position:absolute; bottom:10px; right:50px; color:#0092ef;}
#cboxPrevious{position:absolute; bottom:10px; left:15px; background: #888888 url('../images/sprite.png') no-repeat -10px -60px; width:28px; height:28px; text-indent:-9999px;}
#cboxNext{position:absolute; bottom:10px; left:45px; background: #888888 url('../images/sprite.png') no-repeat -60px -110px; width:28px; height:28px; text-indent:-9999px;}
#cboxLoadingOverlay{background:url(../images/loading_background.png) no-repeat center center;}
#cboxLoadingGraphic{background:url(../images/loading.gif) no-repeat center center;}
#cboxClose{position:absolute; bottom:10px; right:15px; background:url(../images/controls.png) no-repeat -25px 0; width:25px; height:25px; text-indent:-9999px;}
#cboxContent {background: #f1f1f1;overflow: hidden;border: 1px solid d6d6d6; padding: 15px;}

/*
The following fixes a problem where IE7 and IE8 replace a PNG's alpha transparency with a black fill
when an alpha filter (opacity change) is set on the element or ancestor element. This style is not applied to or needed in IE9.
See: http://jacklmoore.com/notes/ie-transparency-problems/
*/
.cboxIE #cboxTopLeft,
.cboxIE #cboxTopCenter,
.cboxIE #cboxTopRight,
.cboxIE #cboxBottomLeft,
.cboxIE #cboxBottomCenter,
.cboxIE #cboxBottomRight,
.cboxIE #cboxMiddleLeft,
.cboxIE #cboxMiddleRight {
filter: progidXImageTransform.Microsoft.gradient(startColorstr=#00FFFFFF,endColorstr=#00 FFFFFF );
}

/*
The following provides PNG transparency support for IE6
Feel free to remove this and the /ie6/ directory if you have dropped IE6 support.
*/
.cboxIE6 #cboxTopLeft{background:url(../images/ie6/borderTopLeft.png);}
.cboxIE6 #cboxTopCenter{background:url(../images/ie6/borderTopCenter.png);}
.cboxIE6 #cboxTopRight{background:url(../images/ie6/borderTopRight.png);}
.cboxIE6 #cboxBottomLeft{background:url(../images/ie6/borderBottomLeft.png);}
.cboxIE6 #cboxBottomCenter{background:url(../images/ie6/borderBottomCenter.png);}
.cboxIE6 #cboxBottomRight{background:url(../images/ie6/borderBottomRight.png);}
.cboxIE6 #cboxMiddleLeft{background:url(../images/ie6/borderMiddleLeft.png);}
.cboxIE6 #cboxMiddleRight{background:url(../images/ie6/borderMiddleRight.png);}

.cboxIE6 #cboxTopLeft,
.cboxIE6 #cboxTopCenter,
.cboxIE6 #cboxTopRight,
.cboxIE6 #cboxBottomLeft,
.cboxIE6 #cboxBottomCenter,
.cboxIE6 #cboxBottomRight,
.cboxIE6 #cboxMiddleLeft,
.cboxIE6 #cboxMiddleRight {
_behavior: expression(this.src = this.src ? this.src : this.currentStyle.backgroundImage.split('"')[1], this.style.background = "none", this.style.filter = "progidXImageTransform.Microsoft.AlphaImageLoader(src=" + this.src + ", sizingMethod='scale')");
}