function tabselect(activetab, activeframe)
{
    document["fourtabs390"].src = activetab;
    document.getElementById("frametabone").style.display = 'none';
    document.getElementById("frametabtwo").style.display = 'none';
    document.getElementById("frametabthree").style.display = 'none';
    document.getElementById("frametabfour").style.display = 'none';
    document.getElementById(activeframe).style.display = 'inline';    
}