document.observe("dom:loaded", function() {

 	if ($('checkoutbutton')) {

		$('checkoutbutton').observe('click', function(event){

			countryChoice = document.selectdeliverycountry.deliverycountry.selectedIndex;
			if (document.selectdeliverycountry.deliverycountry.options[countryChoice].value == "0") {
				alert("Please select your delivery country"); 
				Event.stop(event);
				document.selectdeliverycountry.deliverycountry.focus();
			}

		});
	}
});