function createCookie(name, value, days) 
{
    if (days) {
        var date = new Date;
        date.setTime(date.getTime() + days * 24 * 60 * 60 * 1000);
        var expires = "; expires=" + date.toGMTString();
    } else {
        expires = "";
    }
    document.cookie = name + "=" + value + expires + "; path=/";
}

function readCookie(name) 
{
    var nameEQ = name + "=";
    var ca = document.cookie.split(";");
    for (var i = 0; i < ca.length; i++) {
        var c = ca[i];
        while (c.charAt(0) == " ") {
            c = c.substring(1, c.length);
        }
        if (c.indexOf(nameEQ) == 0) {
            return c.substring(nameEQ.length, c.length);
        }
    }
    return null;
}

var now = new Date();
createCookie( 'clienttime', now.getHours(), 1 );