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function removeItems(el)
{
   while (el.options.length > 1)
      el.remove(el.options.length-1);
}

function insertItems(el, val)
{
   var i=0;
   while (makeModel[i][0] != val) {
      i++
   }
   
   var models=makeModel[i][1];
   for (i=0; i<models.length; i++)
      el.options.add(new Option(models[i], models[i]));
}