js特效 图片展示放大、说明

类似http://www.yidichan.com/kanfangshilu/tiantongyuan.html上面下方的看房实景图部分（绿色块），鼠标滑过上面，会显示图文并茂的注释信息。

Js代码部分：
var dom = (document.getElementById) ? true : false;
var ns5 = ((navigator.userAgent.indexOf("Gecko")>-1) && dom) ? true: false;
var ie5 = ((navigator.userAgent.indexOf("MSIE")>-1) && dom) ? true : false;
var ns4 = (document.layers && !dom) ? true : false;
var ie4 = (document.all && !dom) ? true : false;
var nodyn = (!ns5 && !ns4 && !ie4 && !ie5) ? true : false;

// resize fix for ns4
var origWidth, origHeight;
if (ns4) {
origWidth = window.innerWidth; origHeight = window.innerHeight;
window.onresize = function() { if (window.innerWidth != origWidth || window.innerHeight != origHeight) history.go(0); }
}

// avoid error of passing event object in older browsers
if (nodyn) { event = "nope" }

/////////////////////// CUSTOMIZE HERE ////////////////////
// settings for tooltip
// Do you want tip to move when mouse moves over link?
var tipFollowMouse= true;
var tipWidth= 352;
var offX= 45; // how far from mouse to show tip
var offY= -45;
var tipFontFamily= "Verdana, arial, helvetica, sans-serif";
var tipFontSize= "8pt";
var tipFontColor= "#000000";
var tipBgColor= "#DDECFF";
var origBgColor= tipBgColor; // in case no bgColor set in array
var tipBorderColor= "#cccccc";
var tipBorderWidth= 0;
var tipBorderStyle= "ridge";
var tipPadding= 0;

// preload images that are to appear in tooltip, (width,height)
var img1 = new Image(106,131); img1.src = "images/001.jpg";
var img2 = new Image(90,45); img2.src = "images/001.jpg";

// tooltip content goes here
var messages = new Array();
// multi-dimensional arrays containing
// image, text, bgColor to be sent to tooltip
messages[0] = new Array('images/001.jpg','广场拍摄',"#FFFFFF");
messages[1] = new Array('images/002.jpg','西区走廊',"#FFFFFF");
messages[2] = new Array('images/003.jpg','这个会馆应该是中上产阶级用的',"#FFFFFF");
messages[3] = new Array('images/004.jpg','天通苑艺术教学氛围很浓',"#FFFFFF");
messages[4] = new Array('images/005.jpg','石材的房子，恐怕价格不低',"#FFFFFF");
messages[5] = new Array('images/006.jpg','中心公园',"#FFFFFF");
messages[6] = new Array('images/007.jpg','龙德广场北京第二大商场了',"#FFFFFF");
messages[7] = new Array('images/008.jpg','现代雕塑，看不懂，关于亲情演绎的吧',"#FFFFFF");
messages[8] = new Array('images/009.jpg','天通大厦',"#FFFFFF");
messages[9] = new Array('images/010.jpg','天骄幼儿园',"#FFFFFF");
messages[10] = new Array('images/011.jpg','从东区看中苑的楼',"#FFFFFF");
messages[11] = new Array('images/012.jpg','很和谐',"#FFFFFF");
messages[12] = new Array('images/013.jpg','也是小编超喜欢的楼，很有气质',"#FFFFFF");
messages[13] = new Array('images/014.jpg','中心公园',"#FFFFFF");
messages[14] = new Array('images/015.jpg','西苑的小区内部',"#FFFFFF");
messages[15] = new Array('images/016.jpg','西苑实景',"#FFFFFF");
messages[16] = new Array('images/017.jpg','东区商业街',"#FFFFFF");
messages[17] = new Array('images/018.jpg','这个房子感觉好，天通东苑的',"#FFFFFF");
messages[18] = new Array('images/019.jpg','街心花园',"#FFFFFF");
messages[19] = new Array('images/020.jpg','天通中苑',"#FFFFFF");
messages[20] = new Array('images/021.jpg','远望东区',"#FFFFFF");

//////////////////// END OF CUSTOMIZATION AREA ///////////////////

// to layout image and text, 2-row table, image centered in top cell
// these go in var tip in doTooltip function
// startStr goes before image, midStr goes between image and text
var startStr = '<table height="272" background="pic-bg.gif" width="' + tipWidth + '"><tr><td style="margin-top:5px" align="center" width="100%" valign="middle"><img src="';
var midStr = '" border="0"></td></tr><tr><td style="margin-top:5px" align="center">';
var endStr = '</td></tr></table>';

////////////////////////////////////////////////////////////
// initTip - initialization for tooltip.
// Global variables for tooltip.
// Set styles for all but ns4.
// Set up mousemove capture if tipFollowMouse set true.
////////////////////////////////////////////////////////////
var tooltip, tipcss;
function initTip() {
if (nodyn) return;
tooltip = (ns4)? document.tipDiv.document: (ie4)? document.all['tipDiv']: (ie5||ns5)? document.getElementById('tipDiv'): null;
tipcss = (ns4)? document.tipDiv: tooltip.style;
if (ie4||ie5||ns5) { // ns4 would lose all this on rewrites
tipcss.width = tipWidth+"px";
tipcss.fontFamily = tipFontFamily;
tipcss.fontSize = tipFontSize;
tipcss.color = tipFontColor;
tipcss.backgroundColor = tipBgColor;
tipcss.borderColor = tipBorderColor;
tipcss.borderWidth = tipBorderWidth+"px";
tipcss.padding = tipPadding+"px";
tipcss.borderStyle = tipBorderStyle;

}
if (tooltip&&tipFollowMouse) {
if (ns4) document.captureEvents(Event.MOUSEMOVE);
document.onmousemove = trackMouse;
}
}

window.onload = initTip;

/////////////////////////////////////////////////
// doTooltip function
// Assembles content for tooltip and writes
// it to tipDiv
/////////////////////////////////////////////////
var t1,t2; // for setTimeouts
var tipOn = false; // check if over tooltip link
function doTooltip(evt,num) {
if (!tooltip) return;
if (t1) clearTimeout(t1); if (t2) clearTimeout(t2);
tipOn = true;
if (ns4) {
if (messages[num][2]) tipBgColor = messages[num][2];
else tipBgColor = origBgColor;
var tip = '<table background="pic-bg.gif" bgcolor="' + tipBorderColor + '" width="' + tipWidth + '" cellspacing="0" cellpadding="' + tipBorderWidth + '" border="0"><tr><td ><table bgcolor="' + tipBgColor + '" width="100%" cellspacing="0" cellpadding="' + tipPadding + '" border="0"><tr><td>'+ startStr + messages[num][0] + midStr + '<span style=" text-align:center;font-family:' + tipFontFamily + '; font-size:' + tipFontSize + '; color:' + tipFontColor + ';">' + messages[num][1] + '</span>' + endStr + '</td></tr></table></td></tr></table>';
tooltip.write(tip);
tooltip.close();
} else if (ie4||ie5||ns5) {
var tip = startStr + messages[num][0] + midStr + '<span style=" text-align:center;font-family:' + tipFontFamily + '; font-size:' + tipFontSize + '; color:' + tipFontColor + ';">' + messages[num][1] + '</span>' + endStr;
tipcss.backgroundColor = messages[num][2];
tooltip.innerHTML = tip;
}
if (!tipFollowMouse) positionTip(evt);
else t1=setTimeout("tipcss.visibility='visible'",100);
}

var mouseX, mouseY;
function trackMouse(evt) {
mouseX = (ns4||ns5)? evt.pageX: window.event.clientX + document.body.scrollLeft;
mouseY = (ns4||ns5)? evt.pageY: window.event.clientY + document.body.scrollTop;
if (tipOn) positionTip(evt);
}

/////////////////////////////////////////////////////////////
// positionTip function
// If tipFollowMouse set false, so trackMouse function
// not being used, get position of mouseover event.
// Calculations use mouseover event position,
// offset amounts and tooltip width to position
// tooltip within window.
/////////////////////////////////////////////////////////////
function positionTip(evt) {
if (!tipFollowMouse) {
mouseX = (ns4||ns5)? evt.pageX: window.event.clientX + document.body.scrollLeft;
mouseY = (ns4||ns5)? evt.pageY: window.event.clientY + document.body.scrollTop;
}
// tooltip width and height
var tpWd = (ns4)? tooltip.width: (ie4||ie5)? tooltip.clientWidth: tooltip.offsetWidth;
var tpHt = (ns4)? tooltip.height: (ie4||ie5)? tooltip.clientHeight: tooltip.offsetHeight;
// document area in view (subtract scrollbar width for ns)
var winWd = (ns4||ns5)? window.innerWidth-100+window.pageXOffset: document.body.clientWidth+document.body.scrollLeft;
var winHt = (ns4||ns5)? window.innerHeight+window.pageYOffset: document.body.clientHeight+document.body.scrollTop;
// check mouse position against tip and window dimensions
// and position the tooltip
if ((mouseX+offX+tpWd)>winWd)
tipcss.left = (ns4)? mouseX-(tpWd+offX): mouseX-(tpWd+offX)+"px";
else tipcss.left = (ns4)? mouseX+offX: mouseX+offX+"px";
if ((mouseY+offY+tpHt)>winHt)
tipcss.top = (ns4)? mouseY-(tpHt+offY): mouseY-(tpHt+offY)+"px";
else tipcss.top = (ns4)? mouseY+offY: mouseY+offY+"px";
if (!tipFollowMouse) t1=setTimeout("tipcss.visibility='visible'",100);
}

function hideTip() {
if (!tooltip) return;
// tipcss.visibility = "hidden";
t2=setTimeout("tipcss.visibility='hidden'",100);
tipOn = false;
}

Html页面引用的方式：

由于时间问题这里直接贴出引用部分，放到body里面就可以调试。

<table width="100%" border="0" cellpadding="5" cellspacing="5" class="tbpic2">
<tr bordercolor="#CCCCCC" bgcolor="#D0E3A1">
<td><a href="#" onmouseover="doTooltip(event,14)" onmouseout="hideTip()"><img src="kftp/tiantong-images/015.jpg" width="110" height="80" border="0" /></a></td>
<td><a href="#" onmouseover="doTooltip(event,15)" onmouseout="hideTip()"><img src="kftp/tiantong-images/016.jpg" width="110" height="80" border="0" /></a></td>
<td><a href="#" onmouseover="doTooltip(event,16)" onmouseout="hideTip()"><img src="kftp/tiantong-images/017.jpg" width="110" height="80" border="0" /></a></td>
<td><a href="#" onmouseover="doTooltip(event,17)" onmouseout="hideTip()"><img src="kftp/tiantong-images/018.jpg" width="110" height="80" border="0" /></a></td>
<td><a href="#" onmouseover="doTooltip(event,18)" onmouseout="hideTip()"><img src="kftp/tiantong-images/019.jpg" width="110" height="80" border="0"></a></td>
<td><a href="#" onmouseover="doTooltip(event,19)" onmouseout="hideTip()"><img src="kftp/tiantong-images/020.jpg" width="110" height="80" border="0"></a></td>
<td><a href="#" onmouseover="doTooltip(event,20)" onmouseout="hideTip()"><img src="kftp/tiantong-images/021.jpg" width="110" height="80" border="0"/></a></td>
</tr>
<tr bordercolor="#CCCCCC" bgcolor="#D0E3A1">
<td><a href="#" onmouseover="doTooltip(event,7)" onmouseout="hideTip()"><img src="kftp/tiantong-images/008.jpg" width="110" height="80" border="0"></a></td>
<td><a href="#" onmouseover="doTooltip(event,8)" onmouseout="hideTip()"><img src="kftp/tiantong-images/009.jpg" width="110" height="80" border="0"></a></td>
<td><a href="#" onmouseover="doTooltip(event,9)" onmouseout="hideTip()"><img src="kftp/tiantong-images/010.jpg" width="110" height="80" border="0" /></a></td>
<td><a href="#" onmouseover="doTooltip(event,10)" onmouseout="hideTip()"><img src="kftp/tiantong-images/011.jpg" width="110" height="80" border="0" /></a></a></td>
<td><a href="#" onmouseover="doTooltip(event,11)" onmouseout="hideTip()"><img src="kftp/tiantong-images/012.jpg" width="110" height="80" border="0"/></a></td>
<td><a href="#" onmouseover="doTooltip(event,12)" onmouseout="hideTip()"><img src="kftp/tiantong-images/013.jpg" width="110" height="80" border="0"/></a></td>
<td><a href="#" onmouseover="doTooltip(event,13)" onmouseout="hideTip()"><img src="kftp/tiantong-images/014.jpg" width="110" height="80" border="0"/></a></td>
</tr>
<tr bordercolor="#CCCCCC" bgcolor="#D0E3A1">
<td><a href="#" onmouseover="doTooltip(event,0)" onmouseout="hideTip()"><img src="kftp/tiantong-images/001.jpg" width="110" height="80" border="0"></a></td>
<td><a href="#" onmouseover="doTooltip(event,1)" onmouseout="hideTip()"><img src="kftp/tiantong-images/002.jpg" width="110" height="80" border="0" /></a></td>
<td><a href="#" onmouseover="doTooltip(event,2)" onmouseout="hideTip()"><img src="kftp/tiantong-images/003.jpg" width="110" height="80" border="0" /></a></td>
<td><a href="#" onmouseover="doTooltip(event,3)" onmouseout="hideTip()"><img src="kftp/tiantong-images/004.jpg" width="110" height="80" border="0" /></a></td>
<td><a href="#" onmouseover="doTooltip(event,4)" onmouseout="hideTip()"><img src="kftp/tiantong-images/005.jpg" width="110" height="80" border="0" /></a></td>
<td><a href="#" onmouseover="doTooltip(event,5)" onmouseout="hideTip()"><img src="kftp/tiantong-images/006.jpg" width="110" height="80" border="0" /></a></td>
<td><a href="#" onmouseover="doTooltip(event,6)" onmouseout="hideTip()"><img src="kftp/tiantong-images/007.jpg" width="110" height="80" border="0" /></a>
<div id="tipDiv" style="position:absolute; visibility:hidden; z-index:100; left: 63px; top: 97px;"></div></td>
</tr>
</table>