<div id="part_number">
	      <label for="part_number_number">Part Number</label><br/>
	      <%= f.text_field :number, :size => 30 %>
		<div id="description">
			<em>Enter a part number in order to get the description.</em>
		</div>

## [javascript]
var partNumber = $('part_number_number'),
    loading = new Element('img', {src:'loading.gif'});

partNumber.insert({after:loading});
loading.hide();

partNumber.observe('blur', function(){

  new Ajax.Request('/products/identify', {
    parameters: { number: partNumber.value },
    onLoading: function(){ loading.show(); },
    onComplete: function(){ loading.hide(); }
  });

});

partNumber.autocomplete("/products/autocomplete", {minChars:3,formatItem:formatItem});