function validEmail(str) {
    if (str.indexOf(".") > 2 && str.indexOf("@") > 0)
        return true;
    else
        return false;
}

function validMessage(message) {
    if (message.value != '')
        return true;
    else
        return false;
}

function validForm(email, message) {
    if (validEmail(email.value) != true) {
        alert("Email is not valid!");
        email.focus();
        return false;
    }else if (validMessage(message) != true) {
        alert("Message is empty!");
        message.focus();
        return false;
    }else {
        return true;
    }
}


function toggleLayer(whichLayer) {
    if (document.getElementById) {
        // this is the way the standards work
        var style2 = document.getElementById(whichLayer).style;
            style2.display = style2.display? "":"block";
    }else if (document.all) {
        // this is the way old msie versions work
        var style2 = document.all[whichLayer].style;
        style2.display = style2.display? "":"block";
    }else if (document.layers) {
        // this is the way nn4 works
        var style2 = document.layers[whichLayer].style;
        style2.display = style2.display? "":"block";
    }
}