// JavaScript Document
function ImgShow(evt){
	var imgTag=(window.event)?event.srcElement:evt.target;
	var imgPath=imgTag.src.replace("_thumb.jpg",".jpg");//取得弹出的大图url
	var tagTop=Math.max(document.documentElement.scrollTop,document.body.scrollTop);
	var tag=document.createElement("div");
		tag.style.cssText="width:100%;height:"+Math.max(document.body.clientHeight,document.body.offsetHeight)+"px;position:absolute;background:white;top:0;filter: Alpha(Opacity=80);Opacity:0.8;";
		tag.ondblclick=function(){var clsOK=confirm("确定要取消图片显示吗?"); if(clsOK){closes();}};
	var tagImg=document.createElement("div");
		tagImg.style.cssText="font:12px /18px verdana;overflow:auto;text-align:center;position:absolute;width:200px;border:5px solid gray;background:gray;color:white;left:"+(parseInt(document.body.offsetWidth)/2-100)+"px;top:"+(document.documentElement.clientHeight/3+tagTop)+"px;"
		tagImg.innerHTML="<div style='padding:10px;background:#cccccc;border:1px solid white'><img src='http://www.beaplat.com/file/attachment.php?aid=4987' /><br /><br /><b style='color:#999999;font-weight:normal'>Image loading...</b><br /></div>";
	var closeTag=document.createElement("div");
		closeTag.style.cssText="display:none;position:absolute;left:10px;top:10px;background:red;border:1px solid white;yellow:white;filter:Alpha(Opacity=50);Opacity:0.5;cursor:pointer;";
		closeTag.innerHTML="<b>关闭</b>";
		closeTag.onclick=closes;
	document.body.appendChild(tag);
	document.body.appendChild(tagImg);
	var img=new Image();
		img.src=imgPath;
		img.style.cssText="border:1px solid #cccccc;filter: Alpha(Opacity=0);Opacity:0;";
		tagImg.oncontextmenu=function(){var clsOK=confirm("确定要取消图片显示吗?"); if(clsOK){closes();};return false};
	var barShow,imgTime;
	img.complete?ImgOK():img.onload=ImgOK;
	function ImgOK(){
		var Stop1=false,Stop2=false,temp=0;
		var tx=tagImg.offsetWidth,ty=tagImg.offsetHeight;
		var ix=img.width,iy=img.height;
		var sx=document.documentElement.clientWidth,sy=Math.min(document.documentElement.clientHeight,document.body.clientHeight/*opera*/);
		var xx=ix>sx?sx-50:ix+4,yy=iy>sy?sy-50:iy+3;
		var maxTime=setInterval(function(){
			temp+=35;
			if((tx+temp)<xx){
				tagImg.style.width=(tx+temp)+"px";
				tagImg.style.left=(sx-(tx+temp))/2+"px";
			}else{
				Stop1=true;
				tagImg.style.width=xx+"px";
				tagImg.style.left=(sx-xx)/2+"px";
			}
			if((ty+temp)<yy){
				tagImg.style.height=(ty+temp)+"px";
				tagImg.style.top=(tagTop+((sy-(ty+temp))/2))+"px";
			}else{
				Stop2=true;
				tagImg.style.height=yy+"px";
				tagImg.style.top=(tagTop+((sy-yy)/2))+"px";
			}
			if(Stop1&&Stop2){
				clearInterval(maxTime);
				tagImg.appendChild(img);
				temp=0;
				imgOPacity();
			}
		},1);
		function imgOPacity(){
			temp+=10;
			img.style.filter="alpha(opacity="+temp+")";
			img.style.opacity=temp/100;
			imgTime=setTimeout(imgOPacity,1)
			if(temp>100) clearTimeout(imgTime);
		}
		tagImg.innerHTML="";
		tagImg.appendChild(closeTag);
		if(ix>xx||iy>yy){
			img.alt="左键拖动,双击放大缩小";
			img.ondblclick=function (){
				if(tagImg.offsetWidth<img.offsetWidth||tagImg.offsetHeight<img.offsetHeight){
					img.style.width="auto";
					img.style.height="100%";
					img.alt="双击可以放大";
					img.onmousedown=null;
					closeTag.style.top="10px";
					closeTag.style.left="10px";
					tagImg.style.overflow="visible";
					tagImg.style.width=img.offsetWidth+"px";
					tagImg.style.left=((sx-img.offsetWidth)/2)+"px";
				}else{
					img.style.width=ix+"px";
					img.style.height=iy+"px";
					img.alt="双击可以缩小";
					img.onmousedown=dragDown;
					tagImg.style.overflow="auto";
					tagImg.style.width=xx+"px";
					tagImg.style.left=((sx-xx)/2)+"px";
				}
			}
			img.onmousedown=dragDown;
			tagImg.onmousemove=barHidden;
			tagImg.onmouseout=moveStop;
			document.onmouseup=moveStop;
		}else{
			tagImg.style.overflow="visible";
			tagImg.onmousemove=barHidden;
		}
	}
	function dragDown(a){
		img.style.cursor="pointer";
		var evts=a||window.event;
		var onx=evts.clientX,ony=evts.clientY;
		var sox=tagImg.scrollLeft,soy=tagImg.scrollTop;
		var sow=img.width+2-tagImg.clientWidth,soh=img.height+2-tagImg.clientHeight;
		var xxleft,yytop;
		document.onmousemove=function(e){
			var evt=e||window.event;
			xxleft=sox-(evt.clientX-onx)<0?"0":sox-(evt.clientX-onx)>sow?sow:sox-(evt.clientX-onx);
			yytop=soy-(evt.clientY-ony)<0?"0":soy-(evt.clientY-ony)>soh?soh:soy-(evt.clientY-ony);
			tagImg.scrollTop=yytop;
			tagImg.scrollLeft=xxleft;
			closeTag.style.top=(yytop+10)+"px";
			closeTag.style.left=(xxleft+10)+"px";
			return false;
		}
		return false;
	}
	function barHidden(){
		clearTimeout(barShow);
		if(closeTag.style.display=="none")closeTag.style.display="block";
		barShow=setTimeout(function(){closeTag.style.display="none";},2000);
	}
	function closes(){
		document.body.removeChild(tag);
		document.body.removeChild(tagImg);
		clearTimeout(barShow);
		clearTimeout(imgTime);
		document.onmouseup=null;
		tag=img=tagImg=closeTag=null;
	}
	function moveStop(){
		document.onmousemove=null;
		tagImg.onmousemove=barHidden;
		img.style.cursor="default";
	}
}