function valid_Form(form) {
   
	if (isNotEmpty(form.nom)) {
		if (isNotEmpty(form.email_visiteur)) {
              if (isEMailAddr(form.email_visiteur)) {
                  if (isNotEmpty(form.code_form)) {
				  return true;
		   
			}
		}
	}
 }
	return false;
}


function isNotEmpty(elem) {
	var str = elem.value;
    var re = /.+/;
    if(!str.match(re)) {
        alert("???");
        setTimeout("focusElement('" + elem.form.name + "', '" + elem.name + "')", 0);
        return false;
    } else {
        return true;
    }
}


function isEMailAddr(elem) {
	var str = elem.value;
    var re = /^[\w-]+(\.[\w-]+)*@([\w-]+\.)+[a-zA-Z]{2,7}$/;
    if (!str.match(re)) {
        alert("@");
        setTimeout("focusElement('" + elem.form.name + "', '" + elem.name + "')", 0);
        return false;
    } else {
        return true;
    }
}


function focusElement(formName, elemName) {
    var elem = document.forms[formName].elements[elemName];
    elem.focus();
    elem.select();
}