var aoEngineCodes = {

	    handleSuccess:function(o)
	    {
	        this.processResult(o);
	    },

		handleFailure:function(o)
		{
	        emptySelect( document.getElementById( 'engine_code_filter' ) );
	    },

	    processResult:function(o)
	    {
	        response = o.responseText.parseJSON();
			createSelect( document.getElementById( 'engine_code_filter' ), response[0], response[1] );
	    },

	    startRequest:function( params, selected )
	    {
            loading = new Array( 'Loading...' );
	    	createSelect( document.getElementById( 'engine_code_filter' ), loading, '' );
	    	YAHOO.util.Connect.asyncRequest('POST', '/ajax/ajax.php', aoEngineCodesCallback, "action=getEngineCodes&params=" + params.toJSONString() + '&selected=' + selected );
	    }

	};

	var aoEngineCodesCallback =
	{
	    success:aoEngineCodes.handleSuccess,
	    failure:aoEngineCodes.handleFailure,
	    scope: aoEngineCodes
	};