js cookie

function setCookie(name, value) {
 ??var exp = new Date();
 ??exp.setTime(exp.getTime() + 24 * 60 * 60 * 1000);
 ??document.cookie = name + "=" + escape(value) + ";expires=" + exp.toGMTString();
}
function getCookie(name)
{
 ??var regExp = new RegExp("(^| )" + name + "=([^;]*)(;|$)");
 ??var arr = document.cookie.match(regExp);
 ??if (arr == null) {
 ?????return null;
 ??}
 ??return unescape(arr[2]);
}
function delCookie(name)
 ??{
 ?????var exp = new Date();
 ?????exp.setTime(exp.getTime() - 1);
 ?????var cval=getCookie(name);
 ?????if(cval!=null)
 ????????document.cookie= name + "="+cval+";expires="+exp.toGMTString();
 ??}