Cookie操作

//================================
//Cookie操作
//================================
function getCookieVal (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 getCookieVal (j);
i = document.cookie.indexOf(" ", i) + 1;
if (i == 0)
break;
}
return null;
}

function deleteCookie(cname) {

  var expdate = new Date();
  expdate.setTime(expdate.getTime() - (24 * 60 * 60 * 1000 * 369));

 // document.cookie =" ckValue="ok"; expires="+ expdate.toGMTString();
  setCookie(cname,"",expdate);

}

function setCookie (name, value, expires) {

  document.cookie = name + "=" + escape(value) +
    "; expires=" + expires.toGMTString() ;
}