if(window.addEventListener) {
	window.addEventListener('load', mapRollover, false);
} else if(window.attachEvent){
	window.attachEvent('onload', mapRollover);
} else {
	window.onload = mapRollover;
}

var defaultMapImage;
var mapImage;

function mapRollover() {
	var mapRollover = "hoge"; // ロールオーバーするmapのID
	mapImage = document.getElementById("map_rollover"); // imgのID

	defaultMapImage = mapImage.getAttribute("src");
	
	if(document.getElementById) {
		var areas = document.getElementById(mapRollover).childNodes;
		
		for(var i=0; i < areas.length; i++) {
			if(areas[i])
			{
				areas[i].onmouseover = function() {
					areaID = this.id;
					mapImage.setAttribute("src", "/img/index/" + areaID + ".gif");
				}
				areas[i].onmouseout = function() {
					areaID = this.id;
					mapImage.setAttribute("src", defaultMapImage);
				}
			}
		}
	}
}