why does execCommand('SaveAs') not work

[Mats Lundgren]

Hi
I am new here, and i have a problem
this is for windows and IE users only
http://www.matslundgren.net/Ahtml/testet/text/
I am trying to do a text/HTML editor, but
when I am finished with the document, and saves it,
it works fine, but if I continue to work on the document
everythin freezes and nothing works, that is I can Only save it once, It
works fine in My HTML editor, and when
previewing in IE, but this occurs when I place it on the net.any Ideas what
could be wrong

Thanks
Mats Lundgren