function pop(url,nom,w,h) {
hauteur=Math.round((screen.availHeight-h)/2);
largeur=Math.round((screen.availWidth-w)/2);
window.open(url,nom, "toolbar=0,location=0,directories=0,status=0, scrollbars=0,resizable=0,menubar=0,top="+hauteur+",left="+largeur+",width="+w+",height="+h);
}

function switchdiv(id){
if (document.getElementById) {
if(!document.getElementById(id).style.display){document.getElementById(id).style.display="block"}else{document.getElementById(id).style.display=""};
} else if (document.all) {
//alert(document.all[id].style.display);
if(!document.all[id].style.display){document.all[id].style.display="block"}else{document.all[id].style.display=""};
} else if (document.layers) {
if(!document.layers[id].display){document.layers[id].display="block"}else{document.layers[id].display=""};
}
}