Centering Header image

[kobra]

You should have left the original image???

But the red image is 763px wide and the main wrapper is 736px wide??

#mainWrapper {
    background-color: #ffffff;
    text-align: left;
    width: 736px;
    vertical-align: top;
    }
#logoWrapper {
    width:763px;
    height:256px;
    background-image:url(../images/header_bg.jpg);
    background-repeat:no-repeat;
    text-align: center;
    }

If you want it to extend beyond the main width look at this site source and use the same scheme.