function IsNumeric(chaine)
{
  var m=parseFloat(chaine);
  if (isNaN(m))
    return false
  else
  {
	  m=Number(chaine);
  	  if (isNaN(m))
  	  		return false
	}
	return true
}

function Trim(sString)
{
	while (sString.substring(0,1) == ' ')
		sString = sString.substring(1, sString.length);

	while (sString.substring(sString.length-1, sString.length) == ' ')
		sString = sString.substring(0,sString.length-1);

	return sString;
}

function IsEmail(email)
{
	if ((email.indexOf("@")>=0)&&(email.indexOf(".")>=0)
	&&(email.indexOf(".")<email.length-1)&&(email.indexOf("@")<email.length-1))
 	{
  		point = email.indexOf("..");

  		if (point != -1 )
   			return false;
  		else
		   return true;
	}
	else
		return false;
}

var compteur=0;
function envoyer_une_fois()
{
 compteur++;
 if (compteur>1)
 {
  alert('Vous avez d&eacute;j&agrave; valid&eacute; le formulaire !');
  return false;
 }
 return true;
}