function search_form_submit(){
	var listing_id = $('listing_id').value;
	if(listing_id.length > 0){
		var req = new JsHttpRequest();
		req.onreadystatechange = function(){
			if(req.readyState == 4){
				if(req.responseJS.count>0){
					document.forms['search_form'].submit();
				} else {
					alert('ID not found');
				}
			}
		}
		req.caching = false;
		req.open('POST', ajax_prefix+'?rm=listing_exist_ajax&id='+listing_id, true);
		req.send();

	} else {
		document.forms['search_form'].submit();
	}
	return false;
}