What is the best way to get a cookie by name in JavaScript?

I am using prototype and I can't find any built in extensions to set or retrieve cookies. After googling for a little bit, I see a few different ways to go about it. I was wondering what you think is the best approach for getting a cookie in JavaScript?

From stackoverflow EvilSyn

• I use this. It has been dependable:

  function getCookie(c_name) {
  if (document.cookie.length>0)
    {
    c_start=document.cookie.indexOf(c_name + "=")
    if (c_start!=-1)
   { 
   c_start=c_start + c_name.length+1 
   c_end=document.cookie.indexOf(";",c_start)
   if (c_end==-1) c_end=document.cookie.length
   return unescape(document.cookie.substring(c_start,c_end))
   } 
    }
  return ""
  

  }

  PhiLho : Can be problematic if you search BEL and there is a cookie named REBEL, no?
  From Diodeus

• Anytime I need to access it, I use document.cookie, basically how it's outlined in that article. Caveat, I've never used prototype, so there may be easier methods there that you just haven't run across.

  EvilSyn : Yea I have used quirksmode's get/set cookie code in the past as well.

  Prestaul : I would recommend quirksmode's cookie function as well.
  From Pseudo Masochist

• I use this routine:

  function ReadCookie(name)
  {
    name += '=';
    var parts = document.cookie.split(/;\s*/);
    for (var i = 0; i < parts.length; i++)
    {
      var part = parts[i];
      if (part.indexOf(name) == 0)
        return part.substring(name.length)
    }
    return null;
  }
  

  Works quite well.

  From PhiLho