// Overlay
var Overlay = {};
Overlay.addOverlay = function() {
	var o = document.createElement("div");
	o.style.width = Dimension.bodyWidth()+"px";
	o.style.height = Dimension.bodyHeight()+"px";
	o.id = "bodyOverlay";
	document.body.appendChild(o);
}
Overlay.removeOverlay = function() {
	if (document.getElementById("bodyOverlay")) {
		var o = document.getElementById("bodyOverlay");
		o.parentNode.removeChild(o);
	}
	if (document.getElementById("floatOver")) {
		var f = document.getElementById("floatOver");
		f.parentNode.removeChild(f);
	}
}