javascript 走马灯效果的链接提示

<title>走马灯效果的链接提示</title> 
<center> 
鼠标放过来~ 
</center> 
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<SCRIPT LANGUAGE="JavaScript"> 
window.onerror = null; 
var bName = navigator.appName; 
var bVer = parseInt(navigator.appVersion); 
var NS4 = (bName == "Netscape" && bVer >= 4); 
var IE4 = (bName == "Microsoft Internet Explorer" 
&& bVer >= 4); 
var NS3 = (bName == "Netscape" && bVer < 4); 
var IE3 = (bName == "Microsoft Internet Explorer" 
&& bVer < 4); 
var scroll_length = 150; 
var time_length =50; 
var begin_pos = 200; 
var i; 
var j; 
if (NS4 || IE4) { 
if (navigator.appName == "Netscape") { 
layerStyleRef="layer."; 
layerRef="document.layers"; 
styleSwitch=""; 
}else{ 
layerStyleRef="layer.style."; 
layerRef="document.all"; 
styleSwitch=".style"; 
} 
}

[Ctrl+A 全选注:如需引入外部Js需刷新才能执行]