Adding marquee and blink

Hi,

I have to make 2 additional buttons BLINK and MARQUEE. I couldn't find any plugin
which will do this.

I've tried to write my own plugin using getSelection and InsertHtml and it works but
it removes tags - gives mi only plain text.

To get current selection i'm using:

var sTag = (FCKBrowserInfo.IsIE ? FCK.EditorDocument.selection.createRange().text : new String(FCK.EditorWindow.getSelection()));

and then:

html = '<'+this._tagname+'>' + sTag + '</'+this._tagname+'>';
FCK.InsertHtml( html ) ;

Maybe i should do this using Nodes but i can't fins any nice explanation how to this.

Basicly i wan't to have functionality like STRONG button.

Thanks in advance for any comments and suggestions.