通用弹出层函数

用于弹出背景变暗的层，需要同HTML元素共同使用。

function tinyWindow(obj, w, h){
	$("#overlay").height($("body").height());
	$("#overlay").show();
	$("#tinyWindow").show();
	$("#tinyWindow").width(w);
	$("#tinyWindow").height(h);
	var contentstr = $("#"+obj).html();
	$("#twContent").html(contentstr);
	var arrPageSizes = getPageSize();
	var arrPageScroll = getPageScroll();
	$("#tinyWindow").css({
						 top:(arrPageSizes[3] - h)/2 + arrPageScroll[1],
						 left:(arrPageSizes[2] - w)/2
						 });
	$("#twClose").click(function(){
								 $("#overlay").hide();
								 $("#tinyWindow").hide();
								 });
}

<div class="overlay" id="overlay"></div>
<div class="tinyWindow" id="tinyWindow">
<h2 class="twTitle" id="twTitle"><em>标题</em><span id="twClose">关闭 <img src="img/close.gif" width="16" height="16" /></span></h2>
<div class="twContent" id="twContent">democontent</div>
</div>

其他需要用到的函数

function getPageSize() {
	var xScroll, yScroll;
	if (window.innerHeight && window.scrollMaxY) {	
		xScroll = window.innerWidth + window.scrollMaxX;
		yScroll = window.innerHeight + window.scrollMaxY;
	} else if (document.body.scrollHeight > document.body.offsetHeight){ // all but Explorer Mac
		xScroll = document.body.scrollWidth;
		yScroll = document.body.scrollHeight;
	} else { // Explorer Mac...would also work in Explorer 6 Strict, Mozilla and Safari
		xScroll = document.body.offsetWidth;
		yScroll = document.body.offsetHeight;
	}
	var windowWidth, windowHeight;
	if (self.innerHeight) {	// all except Explorer
		if(document.documentElement.clientWidth){
			windowWidth = document.documentElement.clientWidth; 
		} else {
			windowWidth = self.innerWidth;
		}
		windowHeight = self.innerHeight;
	} else if (document.documentElement && document.documentElement.clientHeight) { // Explorer 6 Strict Mode
		windowWidth = document.documentElement.clientWidth;
		windowHeight = document.documentElement.clientHeight;
	} else if (document.body) { // other Explorers
		windowWidth = document.body.clientWidth;
		windowHeight = document.body.clientHeight;
	}	
	// for small pages with total height less then height of the viewport
	if(yScroll < windowHeight){
		pageHeight = windowHeight;
	} else { 
		pageHeight = yScroll;
	}
	// for small pages with total width less then width of the viewport
	if(xScroll < windowWidth){	
		pageWidth = xScroll;		
	} else {
		pageWidth = windowWidth;
	}
	arrayPageSize = new Array(pageWidth,pageHeight,windowWidth,windowHeight);
	return arrayPageSize;
};

function getPageScroll() {
	var xScroll, yScroll;
	if (self.pageYOffset) {
		yScroll = self.pageYOffset;
		xScroll = self.pageXOffset;
	} else if (document.documentElement && document.documentElement.scrollTop) {	 // Explorer 6 Strict
		yScroll = document.documentElement.scrollTop;
		xScroll = document.documentElement.scrollLeft;
	} else if (document.body) {// all other Explorers
		yScroll = document.body.scrollTop;
		xScroll = document.body.scrollLeft;	
	}
	arrayPageScroll = new Array(xScroll,yScroll);
	return arrayPageScroll;
};