/* mission_default = new Image();
 mission_over = new Image();
 mission_default = "mission_default.png";
 mission_over = "mission_over.png";*/
  


function moveOver(imgObj) {
	if(typeof window.addEventListener != "undefined") {
	   imgObj.addEventListener("mouseover", function(){imgObj.src = imgObj.id + "over.png";}, false);
	   imgObj.addEventListener("mouseout", function(){imgObj.src = imgObj.id + "_default.png";}, false);
    } else {
	imgObj.attachEvent("onmouseover", function(){imgObj.src = imgObj.id + "_over.png";});
	imgObj.attachEvent("onmouseout", function(){imgObj.src = imgObj.id +"_default.png";});
        }
}

function rollover() {
var images = document.getElementsByTagName("img");
var roll = new RegExp("rollover");
var preload = [];
for (var i = 0; i < images.length; i++) {
	if(images[i].id.match(roll)) {
	   preload[i] = new Image();
	   preload[i].src = images[i].id + "_over.png";
	   moveOver(images[i]);
	}
          }
}

if (typeof window.addEventListener != "undefined") {
	window.addEventListener("load",rollover,false);
} else {
	window.attachEvent("onload",rollover)
}