I would like to know if this is possible, What I am trying to do is place a nice custom header on the web dialog, this needs to be a smaller version of the header I am using on my main pages, the header is made up of 4 CSS classes, one for the background, two for the image and the 4th is the text on the right hand side.

If this is possible how do I go about it, this is my style sheet:
.TLCBanner
{
position: fixed;
top: 0px;
left: 0px;
padding: 3px;
background-color:#CF142B;
background-repeat: repeat-x;
width: 100%;
height: 45px;
z-index: 0;
}

.TLCBanner-Left
{
position: fixed;
background-image: url('img/tlc/QLook-Logo-for-Red-BG.png');
background-position: left;
background-color: #CF142B;
width: 106px;
height: 43px;
top:3px;
left:10px;
z-index: 1;
}

.TLCCrosshair-Extend {
background-position: 100px;
background-image: url('img/tlc/QLook-Extend-for-Red-BG.png');
background-repeat: repeat-x;
float:left;
left: 116px;
top: 14px;
right: 16%;
height: 20px;
position: fixed;
z-index: 2;
}

.TLCBanner-Right
{
font-family: tahoma;
font-size: x-large;
font-weight: bold;
color: white;
background-color: #CF142B;
position: fixed;
float: right;
right: 50px;
top: 6px;
height: 40px;
padding-left: 5px;
z-index: 3;
}

Thanks for quick response, the CSS posted above is the one that is used on the main page, as this all needs to be fixed, I posted this to show you what I need to appear in the dialog, I need this sort of header on the dialog, so that if it is resized the logo and text moves with the resize, so with what you have said is it possible to add the 1st logo on the left followed by the line extender graphic and then the text on the right hand side of the dialog, if not then I think I could just hide the dialog header and add the banner to the content loaded in the dialog, that would work would it not ?