function tabChange(num){
for(i=1;i<=3;i++)
{
	document.getElementById("list_" + i).className="normal";
}
if(num>0)
{
 var subMenu = document.getElementById("list_" + num);
 subMenu.className="current";
 if(num==1){
	 subMenu.style.width="55px";
     subMenu.style.left="64px";
 }
 if(num==2){
	 subMenu.style.width="60px";
	 subMenu.style.left="126px";
 }
 if(num==3){
	 subMenu.style.width="106px";
	 subMenu.style.left="440px";
 }
}
}