In IE, the image is appearing at the bottom of the page, below all the content and the tansparent background... I've seen that others have had this problem fixed with the DOCTYPE, however I have that currently.
you've also got errors in search.cgi :
a. "unterminated string literal" javascript error on line 35
b. check out the correct syntax for body on[un]load='...' - should be the name of a function (eg 'load'), not a call of a function (eg 'load()')