var maxWidth=500;
var maxHeight=500;
function getPosXY(a,offset){
	var p=offset?offset.slice(0):[0,0],tn;
	while(a){
		tn=a.tagName.toUpperCase();
		if(tn=='IMG'){
			a=a.offsetParent;continue;
		}
		p[0]+=a.offsetLeft-(tn=="DIV"&&a.scrollLeft?a.scrollLeft:0);
		p[1]+=a.offsetTop-(tn=="DIV"&&a.scrollTop?a.scrollTop:0);
		if(tn=="BODY")
			break;
		a=a.offsetParent;
	}
	return p;
}

function checkComplete(){
	if(checkComplete.__img&&checkComplete.__img.complete)
		checkComplete.__onload();
	}

checkComplete.__onload=function(){
	clearInterval(checkComplete.__timeId);
	var w=checkComplete.__img.width;
	var h=checkComplete.__img.height;
	if(w>=h&&w>maxWidth){
		previewImage.style.width=maxWidth+'px';
	}
	else if(h>=w&&h>maxHeight){
		previewImage.style.height=maxHeight+'px';
	}
	else{
		previewImage.style.width=previewImage.style.height='';
	}
	previewImage.src=checkComplete.__img.src;
	previewUrl.href=checkComplete.href;
	checkComplete.__img=null;
}

function showPreview(e){
	hidePreview();
	previewFrom=e.target||e.srcElement;
	previewImage.src=loadingImg;
	previewImage.style.width=previewImage.style.height='';
	previewTimeoutId=setTimeout('_showPreview()',500);
	checkComplete.__img=null;
}

function hidePreview(e){
	if(e){
		var toElement=e.relatedTarget||e.toElement;
		while(toElement){
			if(toElement.id=='PreviewBox')
				return;
			toElement=toElement.parentNode;
		}
	}
	try{
		clearInterval(checkComplete.__timeId);
		checkComplete.__img=null;
		previewImage.src=null;
	}
	catch(e){}
	clearTimeout(previewTimeoutId);previewBox.style.display='none';
}

function _showPreview(){
	checkComplete.__img=new Image();
	if(previewFrom.tagName.toUpperCase()=='A')
		previewFrom=previewFrom.getElementsByTagName('img')[0];
	var largeSrc=previewFrom.getAttribute("large-src");
	var picLink=previewFrom.getAttribute("pic-link");
	if(!largeSrc)
		return;
	else{
		checkComplete.__img.src=largeSrc;
		checkComplete.href=picLink;
		checkComplete.__timeId=setInterval("checkComplete()",20);
		var pos=getPosXY(previewFrom,[85,0]);
		previewBox.style.left=pos[0]+'px';previewBox.style.top=pos[1]+'px';
		previewBox.style.display='block';
	}
}