function tabpane(titlename,contentname,idnum,length){
    for(var id = 1;id<=length;id++)
    {
            var curtitleid=titlename+id;
            var curcontentid=contentname+id;
            if(id==idnum){
                  document.getElementById(curtitleid).className=titlename+"_1";
                    document.getElementById(curcontentid).style.display="block";
            }
            else{
                    document.getElementById(curtitleid).className=titlename+"_2";
                    document.getElementById(curcontentid).style.display="none";
            }
    }    
}