// JavaScript Document
function ck(num,n){
			for(var i=1;i<=num;i++){
			   if(i==n){
				 document.getElementById('tab'+n).className="main2_tab";
				 document.getElementById('a'+n).style.backgroundImage="url(images/tab-current.gif)";
			   }else{
				  document.getElementById('tab'+i).className="vnone";
				  document.getElementById('a'+i).style.backgroundImage="url(images/tab-back.gif)";
			   }
			}
		}