冬天人呼出的气体成分:有一段图片放大代码！谁能帮我修改！谢谢！

我有一段点击图片图片就会放大的代码，我想把它改成7张图片，点击那张图片就会
弹出相对应的放大图片。谁能帮我改呀！谢谢！！
代码如下：

<script language="JavaScript">
<!--
function MM_showHideLayers() { //v3.0
var i,p,v,obj,args=MM_showHideLayers.arguments;
for (i=0; i<(args.length-2); i+=3) if ((obj=MM_findObj(args[i]))!=null) { v=args[i+2];
if (obj.style) { obj=obj.style; v=(v=='show')?'visible':(v='hide')?'hidden':v; }
obj.visibility=v; }
}

function MM_findObj(n, d) { //v4.01
var p,i,x; if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
if(!x && d.getElementById) x=d.getElementById(n); return x;
}
//-->
</script>
<a href="" onClick="return false"><img name="small" border="0" src="file:///G|/048.gif" width="101" height="95" onClick="MM_showHideLayers('layer2','','show');MM_showHideLayers('layer','','hide');MM_showHideLayers('layer1','','hide');"></a>
<div id="layer2" style="position: absolute; left: 362px; top: 14px; width: 342px; height: 189px; z-index: 1; visibility: hidden">
<table border="0" width="350" height="216" cellspacing="0" cellpadding="0">
<tr bordercolor="#FFFFFF">
<td width="624" valign="top" align="left">
<div align="center">
<center>
<table border="0" width="50%" height="181" cellspacing="0" cellpadding="0">
<tr>
<td width="50%" height="151" valign="top" align="center"><a href="" onclick="return false" ><img src="file:///G|/048.gif" name="big" width="256" height="211" border="0" onclick="MM_showHideLayers('layer2','','hide');MM_showHideLayers('layer','','show');MM_showHideLayers('layer1','','show');return false;"></a> </td>
</tr>
<tr>
<td width="100%" height="12" valign="top" align="center"> </td>
</tr>
</table>
</center>
</div>
</td>
</tr>
</table>
</div>