I tried to use this format attribute within my xhtml file:

<input type="text" style="-wap-input-format: 'NN\,NN\,NN\,NN\,NN\,NN'" name="tipp1"/>

to get something like:


but the mobile always prompts me for characters.
I tried this in the CSS-File as well, but it didn't work either.

btw. the style attribute works fine, as long as I do not use the '\' to quote the ','-charater.

Can anyone help me?
Thanks in advance