function showPopUp(url, height, width, windowName)
{
    if (windowName == null || windowName == "")
    {
        windowName = "PopUp";
    }
        
    if (parseInt(navigator.appVersion, 10) >= 4)
    {
        if (height == null)
        {
            height = 570;
        }
        if (width == null)
        {
            width = 500;
        }
        
        mywindow = window.open(url, "PopUp", 
            "height=" + height + ",width=" + width + ",scrollbars=1,resizable=1");
        mywindow.focus();
        
        return true;
    }
    
    return false;
}

function showHelp(helpUrl)
{
    return showPopUp(helpUrl, 450, 500, "Help")
}