// JavaScript Document

function swapImg() {
	if(document.getElementsByTagName) {
		var target = document.getElementById("topBn").getElementsByTagName("img");
		var area = document.getElementById("Map").getElementsByTagName("area");
		
			area[0].onmouseover = function() {
				target[0].src = "img/bn_01_01.gif";
			}
			area[0].onmouseout = function() {
				target[0].src = "img/bn_01.gif";
			}
			area[0].onclick = function() {
				window.open(this.href, "_blank"); return false;
			}
			
			area[1].onmouseover = function() {
				target[0].src = "img/bn_01_02.gif";
			}
			area[1].onmouseout = function() {
				target[0].src = "img/bn_01.gif";
			}	
	}
}

if(window.addEventListener) {
	window.addEventListener("load", swapImg, false);
}
else if(window.attachEvent) {
	window.attachEvent("onload", swapImg);
}