function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}

function changeImages() {
	if (document.images && (preloadFlag == true)) {
		for (var i=0; i<changeImages.arguments.length; i+=2) {
			document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
		}
	}
}

var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		electrician_03_over = newImage("images/electrician_03-over.png");
		electrician_03_down = newImage("images/electrician_03-down.png");
		electrician_04_over = newImage("images/electrician_04-over.png");
		electrician_04_down = newImage("images/electrician_04-down.png");
		electrician_05_over = newImage("images/electrician_05-over.png");
		electrician_05_down = newImage("images/electrician_05-down.png");
		electrician_06_over = newImage("images/electrician_06-over.png");
		electrician_06_down = newImage("images/electrician_06-down.png");
		electrician_07_over = newImage("images/electrician_07-over.png");
		electrician_07_down = newImage("images/electrician_07-down.png");
		preloadFlag = true;
	}
}