function getposOffset(overlay, offsettype)  {
    var totaloffset=(offsettype=="left")? overlay.offsetLeft : overlay.offsetTop;
    var parentEl=overlay.offsetParent;
    while (parentEl!=null)  {
        totaloffset=(offsettype=="left")? totaloffset+parentEl.offsetLeft : totaloffset+parentEl.offsetTop;
        parentEl=parentEl.offsetParent;
    }
    return totaloffset;
}

function overlay(curobj, subobjstr, opt_position,adjust_height)   {
    if (document.getElementById)    {
        var subobj=document.getElementById(subobjstr)
        subobj.style.display=(subobj.style.display!="block")? "block" : "none"
        var xpos=getposOffset(curobj, "left")+((typeof opt_position!="undefined" && opt_position.indexOf("right")!=-1)? -(subobj.offsetWidth-curobj.offsetWidth) : 0) 
        var ypos=getposOffset(curobj, "top")+((typeof opt_position!="undefined" && opt_position.indexOf("bottom")!=-1)? curobj.offsetHeight : 0)
        subobj.style.left=xpos+"px"
        subobj.style.top=ypos+adjust_height+"px"
        return false
    }
    else
        return true
    }

function overlayclose(subobj)   {
    document.getElementById(subobj).style.display="none"
}