// JavaScript Document
 <!--
              function affichvide(form){
			  var checkEmail = "@.";
			  var checkStr = form.email.value;
			  var EmailValid = false;
			  var EmailAt = false;
			  var EmailPeriod = false;
			  for (i = 0;  i < checkStr.length;  i++)
			  {
			    ch = checkStr.charAt(i);
			    for (j = 0;  j < checkEmail.length;  j++)
			    {
			      if (ch == checkEmail.charAt(j) && ch == "@")
			        EmailAt = true;
			      if (ch == checkEmail.charAt(j) && ch == ".")
			        EmailPeriod = true;
				  if (EmailAt && EmailPeriod)
					break;
				  if (j == checkEmail.length)
					break;
				}
				// if both the @ and . were in the string
			    if (EmailAt && EmailPeriod)
			    {
					EmailValid = true
					break;
				}
			  }
			  if (!EmailValid)
			  {
			    alert("L'adresse électronique rentrée est invalide !");
			    form.email.focus();
			    return (false);
			  }
			  return true;
		}