var popupWin;

function openAlwaysOnTopPopup(url, name, parameters){
    popupWin = window.open(url, name, parameters); 
    if (popupWin != null && !popupWin.closed)
    {
        disableParentFocus();
    }
    else
    {
        alert('Pop-up blocked');
    }
    return popupWin;
}

function disableParentFocus(){

    if(popupWin != null){
        var all = document.all ? document.all : document.getElementsByTagName('*');

        for (var e = 0; e < all.length; e++)
        {
            all[e].onfocus = function(){ if (popupWin != null && !popupWin.closed) { popupWin.focus(); }; };
        }
    }
}