function change_image_header(old){

   var img_link = old.getAttribute("style");

    if (img_link.match("-hover.png")) {

   }
   else
   {
   img_link = img_link.replace("\.jpg", "-hover.jpg");

 //  img_link = img_link.replace("scroll -652px", "scroll 0px");
   old.setAttribute("style", img_link);
   }
 	}

 function change_old_header(old) {
   var img_link = old.getAttribute("style");
   img_link = img_link.replace("-hover.jpg", "\.jpg");

 //  img_link = img_link.replace("scroll 0px", "scroll -652px");
   old.setAttribute("style", img_link);

 	}