Javascript - browser Cookie information

Nobody likes cookies, and more and more websites are allowing viewers to disable these. But here’s some code I used in the early days to read and write cookies.

function createCookie(cookiename,obj)
{   //alert(cookiename);
    var expdate = new Date ();

    //alert(expdate);
    expdate.setTime(expdate.getTime() + 365 * 24 * 60 * 60 * 1000); // 1 year from now

    //alert(expdate);
    var el = document.getElementById(obj);
    var cookievalue;
    if ( el.style.display != "none" ) {
          cookievalue = 'none';
    }
    else {
          cookievalue = 'inline';
    }

    //alert(cookievalue);
    setCookie(cookiename, cookievalue, expdate);
} 

function setCookie(name, value, expires) 
{    document.cookie= name + "=" + escape(value) +
        ((expires) ? "; expires=" + expires.toGMTString() : "") ;
}

function getCookie(name) {
    var c = document.cookie;
    var prefix = name + "=";
    var begin = c.indexOf("; " + prefix);
    if (begin == -1) {
        begin = c.indexOf(prefix);
        if (begin != 0) return null;
    } else {
        begin += 2;
    }
    var end = document.cookie.indexOf(";", begin);
    if (end == -1) {
        end = c.length;
    }
    return unescape(c.substring(begin + prefix.length, end));
}