function OverButton(obj) {
	var oriBackgroundColor = obj.style.backgroundColor;
	obj.style.backgroundColor = 'white';
	obj.onmouseout = function() {
		obj.style.backgroundColor = oriBackgroundColor;
	}
	obj.onmouseup = function() {
		obj.style.backgroundColor = oriBackgroundColor;
	}
}

function NewImage(src) {
	var img = new Image();
	img.src = src; return img;
}