function val_contact(form)
{
    if (form.rens0.value=="" || form.rens1.value=="")
    {
        alert('Please give your name and your firstname !');
        return;
      }	
      if (form.rens2.value=="")
      {
        alert('Please give your email address !');
        return;
    }
    else
    {
        var a=form.rens2.value;
        var test="" + a;
        var val=0;
        for(var k = 0; k < test.length;k++)
        {
          var c = test.substring(k,k+1);
          if(c == "@")
          {
            val=1;;
          }
        }
        if (val == 0)
        {
          alert('Please give a correct email address !');
          return;
        }
    }	
    if (form.rens3.value=="" || form.rens4.value=="")
    {
        alert('Please give your question !');
        return;
    }	
	
	if (form.capt.value=="")
	{
		alert('Please enter the code before submitting your form!');
		return;
	}
	
	// Comparaison des informations de captcha :
	$saisie = MD5(form.capt.value);
	$base = form.validcapt.value;
	if ($saisie != $base)
	{
		alert("The confirmation code doesn't match !");
		return;
	}
	
	
	// Envoi du formulaire :
	form.submit();
}


function val_down(form)
{
    if (form.name.value=="" || form.firstname.value=="")
    {
        alert('Please give your name and your firstname !');
        return;
    }	

    if (form.email.value=="")
    {
        alert('Please give your email address!');
        return;
    }
    else
    {
        var a=form.email.value;
        var test="" + a;
        var val=0;
        for(var k = 0; k < test.length;k++)
        {
          var c = test.substring(k,k+1);
          if(c == "@")
          {
            val=1;;
          }
        }
        if (val == 0)
        {
          alert('Please give a correct email address !');
          return;
        }
    }	

	if (form.capt.value=="")
	{
		alert('Please enter the code before submitting your form!');
		return;
	}
	
	// Comparaison des informations de captcha :
	$saisie = MD5(form.capt.value);
	$base = form.validcapt.value;
	if ($saisie != $base)
	{
		alert("The confirmation code doesn't match !");
		return;
	}
	
	// Envoi du formulaire :
	form.submit();
}