function check_form(f_search, make, model, year, price){
	
	 var what1 = "Select at least 1 search criteria";
   var f_search = document.getElementById('f_search');

   var make = document.getElementById('make');
   var model = document.getElementById('model');
   var year = document.getElementById('year');
   var price = document.getElementById('price');
		 
	 if ((make.value == "") && (model.value == "") && (year.value == "") && ((price.value == "") || (price.value == "max price")) ) {
			alert (what1);
			return false;
   } else {
	 		f_search.submit();
	 }
}