navHover = function() { 
	
	var lis = document.getElementById("navmenu").getElementsByTagName("LI"); 
	
		for (var i=0; i<lis.length; i++) { 
				
				lis[i].onmouseover=function() { this.className+=" iehover"; 
				
			} 
				lis[i].onmouseout=function() { 
					
				this.className=this.className.replace(new RegExp(" iehover\\b"), ""); 
			} 
		} 
	} 
	
	if (window.attachEvent) window.attachEvent("onload", navHover); 
/*
 * tab comment
 * int number
 * int index
 * */
 function change_option(number,index){
 	for(var i=1; i<=number; i++) {
 		document.getElementById("current" + i).className="";
 		document.getElementById("content" + i).style.display="none";
 	}
 	document.getElementById("current"+index).className="current";
 	document.getElementById("content"+index).style.display="block";
 }