function fnCreate(src){
		
		/* 要创建的div的classname */
		var ClassName = "thumbviewbox";
		
		/* 清除已经弹出的窗口，防止冒泡 */	
		em = document.getElementsByClassName(ClassName)
		
		for(var i=em.length-1; i>=0; i--){
			var p = em[i];
			p.parentNode.removeChild(p);
		}
		
		/* 优先创建图片，如果图片没有加载成功，回调自己 */
		var img = document.createElement('img');
		img.setAttribute('src',src);
		var imgwd = img.width;
		var imghg = img.height;
		
		if(imgwd<1)
		{
			var timer = setTimeout("fnCreate('"+src+"')",100);
			return false;
		}
		
		/* 各项参数 */
		var htmlWidth = window.innerWidth;			//可见区域宽度
		var htmlHeight = window.innerHeight;		//可见区域高度
		var divleft = 0;							//将要创建的div的左边距
		var divtop =0;								//将要创建的div的右边距
		var closefunction = 'em=document.getElementsByClassName("'+ClassName+'");for(var i=em.length-1;i>=0;i--){var p=em[i];p.parentNode.removeChild(p);}';	//关闭div的代码
		
		img.setAttribute('onclick',closefunction);
		
		/* 计算通过图片计算div应该在的位置，保证弹窗在页面中央 */
		if(imgwd>htmlWidth*0.8)
		{
			img.setAttribute('width',htmlWidth*0.8);
			divleft=htmlWidth*0.1;
			if(imghg>htmlHeight*0.8)
			{
				divtop = htmlHeight*0.1;
			}else{
				divtop = (htmlHeight-imgwd)/2;
			}
		}else{
			img.setAttribute('width',imgwd);
			divleft= (htmlWidth-imgwd)/2;
			if(imghg>htmlHeight*0.8)
			{
				divtop = htmlHeight*0.1;
			}
			else
			{
				divtop = (htmlHeight-imgwd)/2;
			}
		}

		/* 创建关闭按钮 */
		var closebtn = document.createElement('a');
		closebtn.setAttribute('class','close');
		closebtn.setAttribute('href','javascript:;');
		closebtn.setAttribute('style','position:absolute;top:-20px;right:-5px;cursor:pointer;background:#444;color:#FFF;');
		closebtn.innerHTML = '[close/关闭]';
		closebtn.setAttribute('onclick',closefunction);
		
		/* 创建弹窗 */
		var element = document.createElement('div');
		element.appendChild(img);
		element.appendChild(closebtn);
		element.setAttribute('class',ClassName);
		element.setAttribute('style','border:5px solid #444;position:absolute;top:'+Math.round(divtop)+'px;left:'+Math.round(divleft)+'px;border-radius:5px;background:#FFF');
			
		document.body.appendChild(element);
}