var verif = 0;

function getVille(cp, form, champ)
{
	if (cp.length == 5) {
		if (this.verif==0) {
			new Ajax.Request('/ajax/getAllVilles/?cp='+cp+'&formname='+form+'&champ='+champ, {
				method: 'get',
				onSuccess: function(transport) {
	   				// Execution du javascript recu
					eval(transport.responseText);
				}
			}
			);
			this.verif=1;
		}
	} else {
		this.verif=0;
	}
}