function f_showTab(parDivName,obj,cName)
{
    var par =document.getElementById(parDivName);
    var childs=par.getElementsByTagName('li');
    for(i=0; i<childs.length; i++)
    {
        if (childs[i].id == obj){
            childs[i].className = cName;
            if(document.getElementById(childs[i].id+"_open")){
                document.getElementById(childs[i].id+"_open").style.display = "block";
            }

        } else {
            childs[i].className = "";
            if(document.getElementById(childs[i].id+"_open")){
                document.getElementById(childs[i].id+"_open").style.display = "none";
            }
        }
    }
}