var $hid=function(tagName){return document.getElementById(tagName);}
var userAgent = navigator.userAgent.toLowerCase();
var is_opera = userAgent.indexOf('opera') != -1 && opera.version();
var is_moz = (navigator.product == 'Gecko') && userAgent.substr(userAgent.indexOf('firefox') + 8, 3);
var is_ie = (userAgent.indexOf('msie') != -1 && !is_opera) && userAgent.substr(userAgent.indexOf('msie') + 5, 3);


function nTabs(thisObj,Num,class1,class2){
	if(thisObj.className == class1) return;
	var tabObj = thisObj.parentNode.id;
	var tabList = $hid(tabObj).getElementsByTagName("li");
	for(i=1; i <tabList.length; i++){
		if (i == Num){
		 thisObj.className = class1; 
		$hid(tabObj+"_"+i).style.display = "block";
		}else{
		 tabList[i].className = class2; 
		 $hid(tabObj+"_"+i).style.display = "none";
		}
	} 
}