function cssq(num){
 for(var id = 1;id<=2;id++)
 {
 var MrJin="title2_con"+id;
 if(id==num)
 document.getElementById(MrJin).style.display="block";
 else
 document.getElementById(MrJin).style.display="none";
 }
 if(num==1) 
 document.getElementById("title2").className="title2_title title2_bg1";
 if(num==2)
 document.getElementById("title2").className="title2_title title2_bg2";
 }