请帮我改一下这个代码

<SCRIPT language="JavaScript">
<!--
function www_zxfree_com(offset)
{
var endstr=document.cookie.indexOf(";",offset);if(endstr==-1)
endstr=document.cookie.length;return unescape(document.cookie.substring(offset,endstr));}
function GetCookie(name)
{
var arg=name+"=";
var alen=arg.length;
var clen=document.cookie.length;
var i=0;while(i<clen)
{
var j=i+alen;
if(document.cookie.substring(i,j)==arg)
return www_zxfree_com(j);
i=document.cookie.indexOf(" ",i)+1;if(i==0)
break;
}
return null;
}
function SetCookie(name,value)
{
var argv=SetCookie.arguments;
var argc=SetCookie.arguments.length;
var expires=(2<argc)?argv[2]:null;
var path=(3<argc)?argv[3]:null;
var domain=(4<argc)?argv[4]:null;
var secure=(5<argc)?argv[5]:false;
document.cookie=name+"=&q