function prenom(variable, defaultValue)
{
var re = new RegExp("[?&]" + variable + "=([^&]+)");
var qs = document.location.search;
var m = qs.match(re);
var value = m == null ? '' : m[1];
value = unescape(value);
if ((! value || value == "") && defaultValue) value = defaultValue;
document.write(value);
}