function createSuppCookie(name,value,lifetime) {
    var date = new Date();
    //alert(date.toGMTString());
    date.setTime(date.getTime()+1000*lifetime);
    var expires = "; expires="+date.toGMTString();
    //alert(date.toGMTString());
    document.cookie = name+"="+escape(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;
}

function eraseCookie(name) {
    createSuppCookie(name,"",-1);
}

// return true if referer from the same domain
function CorrectReferer() {
    $rxurl = new RegExp("/(.*?)/", "ig");
    $match = $rxurl.exec(document.location);
    var match = /^(http:\/\/)?(www\.)?(.*?)\/.*?$/i.exec(document.location);
    url = match[match.length-1];
    referrer = document.referrer;
    m = referrer.search("/"+url+"/");
    if (m != "-1") return true;
    else return false;
}

function ValidCookie(name) {
    cookie = readCookie(name);
    if (cookie == "undefined" || cookie == null) return false;
    return true;
}

function showLayer(id) {   
    $("#"+id).css('display', 'block');  
}
function hideLayer(id) {
    $("#"+id).css('display', 'none');   
}