function valid_recherche() {
	if ((document.getElementById('champ_mdr').value == '') || (document.getElementById('champ_mdr').value.length < 2))
	{
		return false;
	}
}

function valid_date(str_date){
	if (str_date != "")
	{
		numDate=str_date.replace("/","");
		numDate=numDate.replace("/","");
		limiteDate=str_date.split("/");
		
		if(str_date.length != 10 || str_date.charAt(2) != '/' || str_date.charAt(5) != '/' || isNaN(numDate)){
			alert('La date doit être au format JJ/MM/AAAA.\n');
			return false;
		}
		else if (limiteDate[0] < 1 || limiteDate[0] > 31 || limiteDate[1] < 1 || limiteDate[1] > 12){
			alert('La date doit être comprise entre le 01/01/AAAA et le 31/12/AAAA.\n');
			return false;
		}
		else
			return true
	}
	else
		return true
}