function myTabs(thisObj,Num){
    if(thisObj.className == "tab_bg")return;
    var tabObj = thisObj.parentNode.id;
    var tabList = document.getElementById(tabObj).getElementsByTagName("li");
    for(i=0; i <tabList.length; i++)
    {
        if (i == Num)
        {
           thisObj.className = "tab_bg"; 
           document.getElementById("nTabs_"+i).style.display = "block";
        }else{
           tabList[i].className = ""; 
           document.getElementById("nTabs_"+i).style.display = "none";
        }
    } 
}

function nTabs(thisObj,Num){
    if(thisObj.className == "default")return;
    var tabObj = thisObj.parentNode.id;
    var tabList = document.getElementById(tabObj).getElementsByTagName("li");
    for(i=0; i <tabList.length; i++)
    {
        if (i == Num)
        {
           thisObj.className = "default"; 
           document.getElementById("desc_"+i).style.display = "block";
        }else{
           tabList[i].className = ""; 
           document.getElementById("desc_"+i).style.display = "none";
        }
    } 
}