var currentSub=null;
function myTab(obj)
{
    if(currentSub)
    {
        currentSub.style.display="none";
    }
    currentSub=document.getElementById("sub_"+obj);
    if(currentSub)
    {
        currentSub.style.display="block";
    }
}
function myInitTab(obj)
{
    var topTab=document.getElementById("top_"+obj);
    if(topTab)
    {
        topTab.onmouseover=null;
        var subTab=document.getElementById("sub_"+obj);
        if(subTab)
        {
            subTab.style.display="block";
        }
    }
}