function tab(num,befor,id,e){
	var el=e.target?e.target.parentNode:e.srcElement.parentNode;
	var pa=el.parentNode.getElementsByTagName("li");
	for(var i=0;i<pa.length;i++){
		pa[i].className="";
	}
	el.className="here";
	var leepg=el.offsetTop;	//tab's top position
	
	for(i=1;i<=num;i++){
		try{
			if(i==befor){
				document.getElementById(id+i).style.display="block";
				//alert(document.getElementById(id+i).offsetTop);
				if(i==1){
					//the first node not set
				}else if(document.getElementById(id+i).offsetTop==0){  //node default position is 0
					document.getElementById(id+i).style.top=leepg+"px";  //node position same tab's position
				}
				//document.getElementById(id+i).style.visibility ="visible";
			}else{
				document.getElementById(id+i).style.display="none";
				//document.getElementById(id+i).style.visibility ="hidden";
			}
		}catch(e){ }
	}
}
function r1()
{}