function isNumeric(sText)
{ 
	return /^[\d\.]+$/.test(sText);
} 

function ChampNumeric(champ)
{
	var temp = "";
	if(champ != null)
	{
		temp = champ.value;
		if (temp != "") {
			if (!isNumeric(temp))
			{
				alert(message_valeur_numerique);
				champ.select();
				champ.focus(); 
				return false;
			}
		}
	}else{
		return true;
	}
}