// Mozilla simplified installTrigger

function installPackage(aEvent,extName,iconURL,iElem)  {   
    if(aEvent.altKey || !window.InstallTrigger) { return true; }
    var url = iElem.href;
    if(url) {
        var params = new Array;
        params[extName] = { URL: url, IconURL: iconURL, toString: function () { return this.URL; } };
        InstallTrigger.install(params);
        return false;
    }
    return true;
}