Untitled

<html>
<head>
<script type="text/javascript">
function changeTextType(a)
{
    if (a = "true")
    {
        alert('its not checked');
    }
    else
    {
        alert('its not checked');
    }
}
</script>
</head>

<body alink="orange" vlink="orange" link="orange">

<input name="secure" type="checkbox" value="chkbox" onclick="changeTextType(this.checked);"/>

</body>
</html>