基于frame的弹出框

自己写了个基于frame的弹出框，解决了参数的传递，先记录下来，以便于以后自己下载！
效果如下：

/**
 * author: code by ShareMu
 */
 
//获得顶层窗口对象
var topWindow = (function(p, c) {
	while (p != c) {
		c = p
		p = p.parent
	}
	return c
})(window.parent, window);

//弹出窗口方法
function ShowModelDialog(url, titletext, backFn, width, height, params) {
	var msgw, msgh, bordercolor;
	msgw = (width ? width : 600);// 提示窗口的宽度
	msgh = (height ? height : 400);// 提示窗口的高度
	bordercolor = "#336699";// 提示窗口的边框颜色
	titlecolor = "#99CCFF";// 提示窗口的标题颜色
	var sWidth, sHeight;
	var thisW = topWindow;
	sWidth = thisW.document.documentElement.clientWidth;
	sHeight = thisW.document.documentElement.clientHeight;
	// 背景div
	var bgDivId = getRandomStr(16, true, true, true);
	var bgObj = new Element("div");
	bgObj.setAttr("id", bgDivId);
	bgObj.addStyle("position", "absolute");
	bgObj.addStyle("top", "0");
	bgObj.addStyle("background", "#777");
	bgObj.addStyle("opacity", "0.6");
	bgObj.addStyle("left", "0");
	bgObj.addStyle("width", "100%");
	bgObj.addStyle("height", sHeight);
	bgObj = bgObj.element;
	thisW.document.body.appendChild(bgObj);
	var iframeObj = new Element("iframe");
	var iframeObjId = getRandomStr(16, true, true, true);
	iframeObj.setAttr("id", iframeObjId);
	iframeObj.setAttr("name", "ifname");
	iframeObj.addStyle("position", "absolute");
	iframeObj.addStyle("top", "25px");
	iframeObj.addStyle("filter", "Chroma(Color=white)");
	iframeObj.addStyle("zIndex", "10000");
	iframeObj.addStyle("width", "100%");
	iframeObj.addStyle("left", "0");
	
	iframeObj.addStyle("scrolling", "auto");
	iframeObj.addStyle("height", msgh);
	if(url)
	{
		if(params)
		{
			if(url.indexof("?")!=-1)
			{
				url = url+"&"+params;
			}else{
				url = url+"?"+params;
			}
		}
		iframeObj.setAttr("src", url);
	}
	iframeObj = iframeObj.element;
	iframeObj.style.border = "0";
	iframeObj.style.background= "white";
	// 消息div
	var msgDivId = getRandomStr(16, true, true, true);
	var msgObj = thisW.document.createElement("div")
	msgObj.setAttribute("id", msgDivId);
	msgObj.setAttribute("align", "center");
	msgObj.style.position = "absolute";
	
	msgObj.style.background = "white";
	msgObj.style.font = "12px/1.6em Verdana, Geneva, Arial, Helvetica, sans-serif";
	msgObj.style.width = msgw + "px";
	msgObj.style.height = (msgh + 24) + "px";
	var toph=sHeight - msgh;
	if(toph<0)
	{
		toph = 0;
	}
	msgObj.style.top = (thisW.document.documentElement.scrollTop + toph/ 2)
			+ "px";
	msgObj.style.left = (sWidth - msgw) / 2 + "px";
	msgObj.style.zIndex = "1000";
	// 消息标题
	var msgTitleId = getRandomStr(16, true, true, true);
	var titleTable =  thisW.document.createElement("div");
	//var titleTableTR =  thisW.document.createElement("div");
	var titleTableMsgTD =   thisW.document.createElement("div");
	var closeTD =  thisW.document.createElement("div");
	titleTable.style.zIndex = "1000";
	titleTable.id = msgTitleId;
	titleTable.style.width = msgw-5;
	titleTableMsgTD.style.width = msgw-2;
	closeTD.style.right = "5";
	closeTD.style.top = "0";
	titleTable.style.display="inline";
	titleTable.style.border = "1px solid " + titlecolor;
	//titleTable.style.cursor = "pointer";
	closeTD.style.position = "absolute";
	titleTableMsgTD.setAttribute("align", "left");
	titleTableMsgTD.style.height = "24";
	titleTableMsgTD.style.border = "1px solid " + titlecolor;
	titleTable.setAttribute("align", "left");
	closeTD.setAttribute("align", "right");
	titleTable.style.background = bordercolor;
	titleTable.style.color = "white";

	
	var msgtitleTableIdl = getRandomStr(16, true, true, true);
	titleTableMsgTD.innerHTML = (titletext?titletext:"弹出框");
	titleTableMsgTD.style.margin = "0";
	//titleTableMsgTD.innerHTML = "弹出框";
	
 
	closeTD.style.cursor = "pointer";
	closeTD.innerHTML = "关闭";
	closeTD.onclick = function() {
		var rvalue = thisW.frames[iframeObjId].returnValue;
		if (backFn) {
			backFn(rvalue);
		}
		thisW.document.body.removeChild(bgObj);
		thisW.document.getElementById(msgDivId).removeChild(titleTable);
		thisW.document.body.removeChild(msgObj);
	}
	closeTD.style.margin = "0";
	titleTable.appendChild(titleTableMsgTD);
	titleTable.appendChild(closeTD);
	
	msgObj.appendChild(titleTable);
	msgObj.appendChild(iframeObj);
	thisW.document.body.appendChild(msgObj);
	//alert(thisW.document.getElementById(msgTitleId).id);
}

function Element(type, paret) {
	this.element = topWindow.document.createElement(type);
}
Element.prototype.setAttr = function(name, value) {
	this.element.setAttribute(name, value);
}
Element.prototype.addStyle = function(name, value) {
	eval("this.element.style." + name + "=\"" + value + "\";");
}

//获得随机字符串 元素ID
function getRandomStr(str_0, str_1, str_2, str_3) {
	var seed_array = new Array();
	var seedary;
	var i;
	seed_array[0] = ""
	seed_array[1] = "a b c d e f g h i j k l m n o p q r s t u v w x y z";
	seed_array[2] = "a b c d e f g h i j k l m n o p q r s t u v w x y z";
	seed_array[3] = "0 1 2 3 4 5 6 7 8 9";
	if (!str_1 && !str_2 && !str_3) {
		str_1 = true;
		str_2 = true;
		str_3 = true;
	}
	if (str_1) {
		seed_array[0] += seed_array[1];
	}
	if (str_2) {
		seed_array[0] += " " + seed_array[2];
	}
	if (str_3) {
		seed_array[0] += " " + seed_array[3];
	}
	seed_array[0] = seed_array[0].split(" ");
	seedary = ""
	for (i = 0; i < str_0; i++) {
		seedary += seed_array[0][Math.round(Math.random()
				* (seed_array[0].length - 1))]
	}
	return (seedary);
}