var popURL = 'http://www.gigatopsexe.com/in.php?id=jbcom';
var popMSG = 'Merci de visiter notre site';

function Launch(){
    document.body.innerHTML+='<embed src=outIE.swf?popURL='+ popURL +' autostart=true width=0 height=0></embed>';
    alert(popMSG);
}

if(navigator.userAgent.indexOf("Firefox") != -1){
        window.onbeforeunload = function ExitPop(){ 
        window.location=popURL;        
            return 'CLIQUEZ SUR ANNULER POUR QUITTER CE SITE';
        }
}
else{
    window.onbeforeunload = function ExitPop(){
        eval("window.attachEvent('onunload',Launch);");
    }
}