Off the bat what I can see is:
a) You have mixed HTML and XHTML coding in the head and elsewhere.
b) OnLoad in the body tag needs to be all lower case if you are keeping your XHTML coding.
c) the javascript in the body tag isn't right
Code:
<body leftmargin="0" rightmargin="0" topmargin="0" bottommargin="0" OnLoad="rotateImage('rImage')"; initLightbox()">
d) All those margin attributes in the body tag should be removed and set in the stylesheet while you are fixing that line.
e) there's a script error at line 280 - fadeimages2 undefined.