//<![CDATA[
	
	var previewBox = document.getElementById('PreviewBox');
	var previewImage = document.getElementById('PreviewImage');
	var previewUrl = document.getElementById('previewUrl');
	var previewFrom = null;
	var previewTimeoutId = null;
	var loadingImg = '/images/loading.gif';
	var maxWidth = 250;
	var maxHeight = 250;
	
	/**
	 * 获取页面元素的坐标
	 */
	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;
		//previewImage.style.display = '';
	}

	/**
	 * 500毫秒后激发预览操作
	 */
	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;
	}
	
	/**
	 * 取消预览
	 */
	function hidePreview(e) {
		if (e) {
			var toElement = e.relatedTarget || e.toElement;
			//alert(toElement.innerHTML);
			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';
	}

	/**
	 *  预览操作
	 */
	function _showPreview() {
		//previewImage.style.display = 'none';
		checkComplete.__img = new Image();
		if (previewFrom.tagName.toUpperCase() == 'A')
			previewFrom = previewFrom.getElementsByTagName('img')[0];
		//获取大图的URL
		var largeSrc = previewFrom.getAttribute("large-src");
		var picLink = previewFrom.getAttribute("pic-link");
		var picContent = previewFrom.getAttribute("pic-content");
		if (!largeSrc) return;
		else {
			checkComplete.__img.src = largeSrc;
			checkComplete.href = picLink;
			document.getElementById('DivPicContent').innerHTML = picContent;
			checkComplete.__timeId = setInterval("checkComplete()", 20);
			var pos = getPosXY(previewFrom, [75, -2]);
			previewBox.style.left = pos[0] + 'px';
			previewBox.style.top = pos[1] + 'px';
			previewBox.style.display = 'block';
		}
	}
	//]]>