$(document).ready(
	function(){
		$("#txt1").autocomplete(
			"/handlers/AutocompleteData.ashx",
			{
			extraParams: {
			db: function() { return $('[name=db]').val(); },
			c:"ZAMBIA' OR Country = 'BOTSWANA"
			},
			autofill:true,
			delay:200,
			selectOnly:true,
			mustMatch:0
			}
		);
	}
);