function valider_recherche()
{
	try
	{
	    debut = new Date();
	    debut.setFullYear(document.recherche.dy.value, document.recherche.dm.value, document.recherche.dj.value);
	    if (debut == "Invalid Date")
	        throw "debut";
	    fin = new Date();
	    fin.setFullYear(document.recherche.fy.value, document.recherche.fm.value, document.recherche.fj.value);
	    if (fin == "Invalid Date")
	        throw "fin";
		document.recherche.submit();
	}
	catch(e)
	{
	    alert(" la date de "+ e + " est invalide ");
	    return;
	}
}