function _jsShowPopup(url, width, height)
{
    var w=width+20;
    var h=height+10;
    var posLeft= (screen.width/2) - (width/2);
    var posTop= (screen.height/2) - (height/2);
    var wndPopup;
    wndPopup = window.open(url, 'wndPopup', "height="+h+", width="+w+", locationbar=false,menubar=false,status=no,resizable=yes,scrollbars=yes,left="+posLeft+",top="+posTop+"");         
    wndPopup.focus ();
    if (wndPopup)
    	return false;
    else
    	return true;
}