function call() {
 var num=document.getElementsByTagName("div")[1].id;
 url=new Array("profile","forte","cd","concert","mail");
 bgimage="url(images/"+url[((num+1).substr(2,1))-1]+"_over.gif)";
 bgposi="M"+num.substr(2,1);
 document.getElementById(bgposi).style.backgroundImage=bgimage;
 }