Validation results:
http://validator.w3.org/check?verbose=1&uri=http%3A%2F%2Fwww.desertedhospitals.com%2Fphotos%2F (should be pretty self-explanatory).
Edit
http://www.desertedhospitals.com/photos/themes/igames/template.html - there mustn't be HTML code between
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
and
<html dir="{LANG_DIR}">
Replace the content of template.html with
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html dir="{LANG_DIR}">
<head>
<title>{TITLE}</title>
<meta http-equiv="Content-Type" content="text/html; charset={CHARSET}" />
<meta http-equiv="Pragma" content="no-cache" />
{META}
<link rel="stylesheet" href="themes/igames/style.css" type="text/css" />
<script type="text/javascript" src="scripts.js"></script>
<script language="JavaScript" type="text/JavaScript">
<!--
function MM_findObj(n, d) { //v4.01
var p,i,x; if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
if(!x && d.getElementById) x=d.getElementById(n); return x;
}
function MM_showHideLayers() { //v6.0
var i,p,v,obj,args=MM_showHideLayers.arguments;
for (i=0; i<(args.length-2); i+=3) if ((obj=MM_findObj(args[i]))!=null) { v=args[i+2];
if (obj.style) { obj=obj.style; v=(v=='show')?'visible':(v=='hide')?'hidden':v; }
obj.visibility=v; }
}
//-->
</script>
</head>
<body>
<div id="CUSTOM_HEADER">
{CUSTOM_HEADER}
</div>
<div class="top_panel">
<div class="top_panel_left">
<div class="top_panel_right">
<div id="SELECT_LISTS">
{THEME_SELECT_LIST}
{LANGUAGE_SELECT_LIST}
</div>
<h1>{GAL_NAME}</h1>
<h3>{GAL_DESCRIPTION}</h3>
</div>
</div>
</div>
<div class="top_panel_btm">
</div>
<div id="MENUS">
<div id="SUB_MENU">
{SUB_MENU}
</div>
<div id="SYS_MENU">
{SYS_MENU}
</div>
</div>
<div id="GALLERY" style="text-align:center;">
{ADMIN_MENU}
{GALLERY}
</div>
<div id="SELECT_FLAGS">
{LANGUAGE_SELECT_FLAGS}
</div>
<div id="CUSTOM_FOOTER">
{CUSTOM_FOOTER}
</div>
<div id="VANITY">
{VANITY}
</div>
</body>
for a start.
Code like
<div align="center"<img src="http://www.desertedhospitals.com/top.jpg" align="top" <table border="0" align="top">
is just invalid and will have undesired and unforseeable results. If you have the same code on other pages, they will look strange as well. Ommitting the <body>-tag is not a bright idea either.
This is all plain HTML and not some special Coppermine stuff. I suggest reading some good HTML tutorials for a start.
As suggested above as well, there is no rollover code to be found, neither on your gallery nor on the rest of your site. Read up the term "rollover".