function onButtonClick() {
  getColors($get("make").value, $get("model").value);
}


function fillOptionsList(selectId, result){
   // get the HTML select list to fill with option elements
   var selectList = document.getElementById(selectId);

   // clear the select list's options
   selectList.options.length = 0;

   //add the options from the web server method's results
   for (var i=0; i < result.length; i++)
   {
      var option = new Option(result[i], result[i]);
      selectList.options.add(option);
   }
}


function getColors(make, model){
   CarService.GetColors(make, model, onGetColorsSuccess, onFail);
}


function onGetColorsSuccess(result) {
   fillOptionsList("color", result);
}


function onFail(result) {
   alert(result.get_message());
}