function addMap() {
	document.getElementById('img_map').innerHTML = '<img style="position: absolute; top:0; left: 0; z-index: -1;" src="/img/flash.jpg" alt="" id="flash_off" usemap="#Map">';
}

if(window.attachEvent) {
	window.attachEvent("onload", addMap);
	}
	else {
	window.addEventListener("load", addMap, true);
	}