function createCookie(name,value,days) {
    if (days) {
        var date = new Date();
        date.setTime(date.getTime()+(days*4*60*60*1000));
        var expires = "; expires="+date.toGMTString();
    }
    else {var 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;
}

function acknowledge() {
    createCookie('cautionRead', true, 1);
    updateContact();
}

function updateContact() {
    var cautionRead = readCookie('cautionRead');
    // Show caution.
    if (!cautionRead) {
        var line1 =  '<a href="../../readme-before-apply.html">仕事に応募する前に</a>をご一読ください。';   
        var line2 =  '<form><input onclick="acknowledge()" type="button" value="読んだ"></form>';
        elem.innerHTML = line1 + line2;
    } else {
        var text = document.createTextNode("Here we go.");
        elem.innerHTML = contactHTML;
    }
}

YAHOO.util.Event.onContentReady('contact', function() {
    elem = document.getElementById("contact");
    contactHTML = elem.innerHTML;

    // Detect cookie support
    var cookieEnabled=(navigator.cookieEnabled)? true : false;
    //if not IE4+ nor NS6+
    if (typeof navigator.cookieEnabled=="undefined" && !cookieEnabled){ 
        document.cookie="testcookie";
        cookieEnabled=(document.cookie.indexOf("testcookie")!=-1)? true : false;
    }
    if (cookieEnabled) {        
        updateContact();
    }
});