Javascript: Alert Lightbox

var dlgAlert = function(msg, opts) {
	if (typeof opts != "object") opts = {};
	var optsd = {
		background: "#eee",
		borderRadius: 5,
		btnCloseBR: 5,
		btnCloseCap: "Close",
		btnCloseWidth: 150,
		textAlign: "left",
		fontColor: "#000",
		fontSize: 14,
		headerBgColor: "#fff",
		headerFontClr: "#000",
		headerFontSize: 16,
		headerFontWeight: "bold",
		headerHeight: 40,
		headerPadX: 10,
		headerPadY: 0,
		headerTextAlign: "left",
		height: 200,
		paddingX: 10,
		paddingY: 10,
		shaderColor: "#333",
		shaderOpacity: 0.5,
		shaddow: "",
		title: "Alert",
		width: 300
	};
	for (var c in optsd) {
		if (!optsd.hasOwnProperty(c)) continue;
		if (typeof opts[c] == "undefined") opts[c] = optsd[c];
	}
	/*
	сделать проверку входящих opts
	*/
	var d = {};
	d.main = document.createElement("DIV");
	d.main.style.fontSize = ("" + opts.fontSize + "px");
	d.main.style.fontFamily = "Tahoma, Arial, Helvetica, 'Helvetica Neue', 'Lucida Grande', Verdana, sans-serif";
	d.main.style.fontStyle = "normal";
	d.main.style.fontWeight = "normal";
	d.main.style.lineHeight = "normal";
	d.main.style.textAlign = "left";
	d.inner = document.createElement("DIV");
	d.inner.style.position = "absolute";
	d.inner.style.left = "0";
	d.inner.style.right = "0";
	d.inner.style.top = "0";
	d.inner.style.bottom = "0";
	d.inner.style.zIndex = 2147483500;
	d.inner.style.overflow = "hidden";
	d.main.appendChild(d.inner);
	d.shad = document.createElement("DIV");
	d.shad.style.position = "fixed";
	d.shad.style.left = "0";
	d.shad.style.right = "0";
	d.shad.style.top = "0";
	d.shad.style.bottom = "0";
	d.shad.style.background = opts.shaderColor;
	d.shad.style.opacity = opts.shaderOpacity;
	d.shad.style.zIndex = "-1";
	d.inner.appendChild(d.shad);
	d.cont = document.createElement("DIV");
	d.cont.style.position = "fixed";
	d.cont.style.width = "100%";
	d.cont.style.height = "100%";
	d.cont.style.textAlign = "center";
	d.inner.appendChild(d.cont);
	d.vsp = document.createElement("DIV");
	d.vsp.style.display = "inline-block";
	d.vsp.style.height = "100%";
	d.vsp.style.width = "0";
	d.vsp.style.verticalAlign = "middle";
	d.cont.appendChild(d.vsp);
	d.box = document.createElement("DIV");
	d.box.style.display = "inline-block";
	d.box.style.width = "" + opts.width + "px";
	d.box.style.height = "" + opts.height + "px";
	if (opts.borderRadius) {
		d.box.style.borderRadius = "" + opts.borderRadius + "px";
	}
	d.box.style.verticalAlign = "middle";
	d.box.style.background = opts.background;
	d.box.style.overflow = "hidden";
	d.cont.appendChild(d.box);
	d.header = document.createElement("DIV");
	d.header.style.height = "" + opts.headerHeight - (2 * opts.headerPadY) + "px";
	d.header.style.width = "" + (opts.width - opts.headerPadX * 2) + "px";
	d.header.style.padding = "" + opts.headerPadY + "px " + opts.headerPadX + "px";
	d.header.style.lineHeight = d.header.style.height;
	d.header.style.fontSize = opts.headerFontSize;
	d.header.style.fontWeight = opts.headerFontWeight;
	d.header.style.color = opts.headerFontClr;
	d.header.style.background = opts.headerBgColor;
	d.header.style.textAlign = opts.headerTextAlign;
	d.header.innerHTML = opts.title;
	d.box.appendChild(d.header);
	d.body = document.createElement("DIV");
	d.body.style.height = "" + opts.height - (opts.headerHeight * 2 + opts.paddingY * 2) + "px";
	d.body.style.width = "" + (opts.width - opts.paddingX * 2) + "px";
	d.body.style.padding = "" + opts.paddingY + "px " + opts.paddingX + "px";
	d.body.style.textAlign = opts.textAlign;
	d.body.innerHTML = msg;
	d.box.appendChild(d.body);
	d.btnWrap = document.createElement("DIV");
	d.btnWrap.style.height = "" + (opts.headerHeight - opts.paddingY) + "px";
	d.btnWrap.style.width = "" + opts.width + "px";
	d.btnWrap.style.padding = "0 0 " + opts.paddingY + "px 0";
	d.btnWrap.style.textAlign = "center";
	d.box.appendChild(d.btnWrap);
	d.btnClose = document.createElement("BUTTON");
	d.btnClose.style.margin = "0";
	d.btnClose.style.padding = "0";
	d.btnClose.style.outline = "0";
	d.btnClose.style.cursor = "pointer";
	d.btnClose.innerHTML = opts.btnCloseCap;
	d.btnClose.style.border = "1px solid #bcbcbc";
	if (opts.btnCloseBR) d.btnClose.style.borderRadius = "" + opts.btnCloseBR + "px";
	d.btnClose.style.fontSize = "" + opts.fontSize + "px";
	d.btnClose.style.width = "" + (opts.btnCloseWidth - 2) + "px";
	d.btnClose.style.height = "" + (opts.headerHeight - opts.paddingY - 2) + "px";
	d.btnClose.style.lineHeight = d.btnClose.style.height;
	d.btnClose.setAttribute("onclick", "document.body.removeChild(this.parentNode.parentNode.parentNode.parentNode.parentNode)");
	d.btnWrap.appendChild(d.btnClose);
	document.body.appendChild(d.main);
	return d;
};