Introduction:
We Can do the following three functionalities using cookies,

1.Retrieving the value of a cookie according to its name

2.Setting a cookie to a desired attribute

3.Deleting a cookie

Main:

For Setting Values in cookie,

function setCookie(name, value, expires, path, domain, secure)
{
    var curCookie = name + “=” + escape(value) +
      ((expires) ? “; expires=” + expires.toGMTString() : “”) +
      ((path) ? “; path=” + path : “”) +
      ((domain) ? “; domain=” + domain : “”) +
      ((secure) ? “; secure” : “”)

  if (!caution || (name + “=” + escape(value)).length <= 4000)
    document.cookie = curCookie
  else
    if (confirm(“Cookie exceeds 1KB and will be cut!”))
       document.cookie = curCookie
}

For Retrieving a values in cookie,

function getCookie(name)
{
   var prefix = name + “=”
   var cookieStartIndex = document.cookie.indexOf(prefix)
   if (cookieStartIndex == ?1)
      return null
   var cookieEndIndex = document.cookie.indexOf(“;”, cookieStartIndex +
                         prefix.length)
   if (cookieEndIndex == ?1)
       cookieEndIndex = document.cookie.length
   return unescape(document.cookie.substring(cookieStartIndex +
                   prefix.length, cookieEndIndex))
}

For Deleting Cookie,

function deleteCookie(name, path, domain)
{
    if (getCookie(name))
    {
        document.cookie = name + “=” +
      ((path) ? “; path=” + path : “”) +
      ((domain) ? “; domain=” + domain : “”) +
      “; expires=Thu, 01-Jan-70 00:00:01 GMT”
    }
}

Conclusion:
Hope,this helps,
Happy Coding.