var wndHelp = null;
function LaunchHelp(url) {
    var shouldOpen = false;
    var w = 1000; var h = 600;
    var name = "help";
    
    if(!wndHelp) {
        shouldOpen = true;
    }
    else {
        if(wndHelp.closed) {
           shouldOpen = true;
        }
    }

    if(shouldOpen) {
       wndHelp = window.open("",name,"height=" + h + ",width=" + w + ",dependent,scrollbars");
    }
    if(wndHelp) {
       wndHelp.location = url;
       wndHelp.focus();
    }
    return false;
}