function autocompleteZipcode() 
{
	if($('cp'))
	{
		new Ajax.Autocompleter("cp", "resultcp", "/zipcode/index.phtml", {
		 paramName: "cp",
		 minChars: 2,
		 afterUpdateElement : CompleteVille
		});
	}
}
function CompleteVille(text, li) 
{
    $('ville').value =  li.id;
}

Event.observe(window, "load", autocompleteZipcode);