document.getElementById与lhgdialog.js冲突，导致JS错误！

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" lang="UTF-8">
<head>
<title>haha</title>
<script language="javascript"> 
var isResizing=false; 
function Resize_mousedown(event,obj){ 
obj.mouseDownX=event.clientX; 
obj.leftTdW=obj.previousSibling.offsetWidth; 
obj.setCapture(); 
isResizing=true; 
} 
function Resize_mousemove(event,obj){ 
if(!isResizing) return ; 
var newWidth=obj.leftTdW*1+event.clientX*1-obj.mouseDownX; 
if(newWidth>0) obj.previousSibling.style.width = newWidth+'px'; 
else obj.previousSibling.style.width=1+'px'; 
} 
function Resize_mouseup(event,obj){ 
if(!isResizing) return; 
obj.releaseCapture(); 
isResizing=false; 
} 
function Resize_setDefault(event,obj){ 
if(obj.innerText=="<") { 
obj.parentNode.previousSibling.style.width=1+'px'; 
obj.innerText=">"; 
} 
else{ 
obj.parentNode.previousSibling.style.width=183+'px'; 
obj.innerText="<"; 
} 
event.cancelBubble=true; 
} 
</script>
<style>
html, body {
margin:0;
padding:0;
height:100%;
overflow: auto;
}
</style>
</head>
<body>
<table style="width:100%;height:100%;" border=0 cellspacing=0 cellpadding=0px >
<tr>
<td style='width:183px; bgcolor="#e8f3f9"'>
<iframe id="_flash123" width="0" height="0" scrolling="no" frameborder="0" marginwidth="0" marginheight="0" ></iframe>
<SCRIPT LANGUAGE="JavaScript"> 
var flashmp3= document.getElementById("_flash123");
flashmp3.style.width="100%";
flashmp3.style.height=document.documentElement.clientHeight;
flashmp3.src="FlashMusic.asp";
</SCRIPT>
</td>
<td style="width:3px;cursor:e-resize;background-color:#cccccc;" align="center" valign="middle" onmousedown="Resize_mousedown(event,this);" onmouseup="Resize_mouseup(event,this);"onmousemove="Resize_mousemove(event,this);">
<font style="size:3px;background-color:#eeeeee;cursor:pointer;" onmousedown="Resize_setDefault(event,this);"><</font></td>
<td>
<iframe id="_blog123" width="0" height="0" scrolling="Auto" frameborder="0" marginwidth="0" marginheight="0" ></iframe>
<SCRIPT LANGUAGE="JavaScript">
var blog_index= document.getElementById("_blog123");
blog_index.style.width="100%";
blog_index.style.height=document.documentElement.clientHeight;
blog_index.src="http://127.0.0.1";
</SCRIPT>
</td>
</tr>
</table>
</body>
</html>上面是我的代码，运行和lhgdialog.js里的Math.max冲突，出现JS错误，不能正常弹窗！
lhgdialog.js的下载地址：
http://code.google.com/p/lhgdialog/downloads/list请大侠们帮忙看看哈！