function getCookie(name) {
     var start = document.cookie.indexOf(name + "=");
     var len = start + name.length + 1;
     if ((!start) && (name != document.cookie.substring(0, name.length))) return null;
     if (start == -1) return null;
     var end = document.cookie.indexOf(";", len);
     if (end == -1) end = document.cookie.length;
     return unescape(document.cookie.substring(len, end));
 }


function setCookie(cookieName,cookieValue,DayValue)
{
	var expire = "";
	var day_value=1;
	if(DayValue!=null)
	{
		day_value=DayValue;
	}
    expire = new Date((new Date()).getTime() + day_value * 864000000);
    expire = "; expires=" + expire.toGMTString();
	document.cookie = cookieName + "=" + cookieValue +";path=/"+ expire;
}

function delCookie(cookieName)
{
	var expire = "";
    expire = new Date((new Date()).getTime() - 1 );
    expire = "; expires=" + expire.toGMTString();
	document.cookie = cookieName + "=" + escape("") +";path=/"+ expire;
 
}