Previewing a TextBox that has HTML with a Popup Window

Here is a nifty way to preview HTML in a TextBox. I use the ScriptManager and $get the TextBox ID before popping the window and then filling it.

        <script type="text/javascript" language="javascript" >
        function preview() {
            var txt= $get('txtContent');
            var sHTML= txt.value;
            win = window.open(", ", 'popup', 'toolbar = no, status = no');
            win.document.write("" + sHTML + "");
        }
        </script>

Reference: http://javascript.internet.com/forms/html-preview.html