$(document).ready(function(){

	//Preload the menu images
	jQuery.preloadImages = function(){
		for(var i = 0; i<arguments.length; i++){
			jQuery("<img>").attr("src", arguments[i]);
		}
	}
	$.preloadImages("assets/images/cow/mylowend.png", "assets/images/cow/pull5k.png", "assets/images/cow/thisonegoesto11.png", "assets/images/cow/turndownthehighs.png");
	
	//Image Array
	$.imageArray = new Array();
	$.imageArray[0] = "mylowend.png";
	$.imageArray[1] = "pull5k.png";
	$.imageArray[2] = "thisonegoesto11.png";
	$.imageArray[3] = "turndownthehighs.png";

	$.hideCow = function(){
		$(".cow").slideUp("normal");
	}
	$.showCow = function(){
		var rand_no = Math.ceil(4*Math.random()) - 1;
		$(".cow").css({ "background-image" : "url(assets/images/cow/" + $.imageArray[rand_no] + ")" }).slideDown("normal");
		setTimeout( "$.hideCow()", 6000);
	}
	setInterval ( "$.showCow()", 30000 );
});