// JavaScript Document
function setCookie (c_name, value, expiredays)
{
    var exdate=new Date();
    exdate.setDate(exdate.getDate()+expiredays);
    document.cookie = c_name + "=" + escape(value) + ((expiredays==null) ? "" : ";expires="+exdate.toGMTString())
}

function getCookie(c_name)
{
    if (document.cookie.length>0)
    {
        c_start = document.cookie.indexOf(c_name + "=");
        if (c_start!=-1)
        { 
            c_start = c_start + c_name.length + 1 ;
            c_end = document.cookie.indexOf(";", c_start);
            if (c_end==-1) c_end=document.cookie.length
                return unescape(document.cookie.substring(c_start, c_end));
        } 
    }
    return "";
}

function eraseCookie(c_name) {
    setCookie (c_name, "", -1);
}

function checkCookies() {
    var testReturn = "";
    setCookie("test_cookie", "test", 1);
    testReturn = getCookie("test_cookie");
    if (testReturn != "test") {
        eraseCookie("test_cookie");
        return false;
    }
    eraseCookie("test_cookie");
    return true;
}