I've made a few modifiations to tab creator:
The Following Elements can now be added:
3> Muting Strings
Also, Each element has its own button. Once you press a button for a specfic symbol, it is automatically added to the string you just added a note to.
The following functions were added:
1> Next Chord: When you are working on chords, you can now add as many chords as you like without having to stop and start recording again.
There also have been some GUI changes to accomodate different browsers.
I tested on Firefox 1.0 and 1.5, IE 6.0 and Opera. Let me know which one I missed...