Remark: If this is a java window, not a javascript-
based html code, this **may work** with filters 
(+*.gif +*.jpg and so on), but java applets aren't 
always properly handled, too. The buggest problem is 
that in some cases, the engine can detect, and 
successfully download imported files from java 
applets, but NOT rewrite the urls in these applets 
(due to absolute http:// URLs, and because the java 
code is binary!)