function view_img(img) 
	{
	  image_window = open(img, "image_window", "scrollbar=yes,menubar=no,toolbar=no,width=500,height=450");
	}
	
function open_doc(doc) 
	{
	  document_window = open(doc, "document_window", "scrollbar=yes,menubar=no,toolbar=no,width=800,height=400");
	}