//buttonImg = "images/menubutton1.png";
//highlightedButtonImg = "images/menubuttonover1.png";

//var preload = new Image();
//preload.src = highlightedButtonImg;

$(document).ready(function(){

    //When mouse rolls over link
    $(".menuButtonDiv img").mouseover(function(){
		var substr = $(this).attr("src").split("menubutton");
		highlightedButtonImg = "images/menubuttonover" + substr[1];
        $(this).attr("src", highlightedButtonImg);

    });
	
    //When mouse is removed from link
    $(".menuButtonDiv img").mouseout(function(){
		var substr = $(this).attr("src").split("menubuttonover");
		buttonImg = "images/menubutton" + substr[1];
        $(this).attr("src", buttonImg);
    });
	
});