There was no error in the browsers.
But now I changed back to "http://www.imathas.com/cgi-bin/mimetex.cgi" and it works fine suddenly I see the
Maybe there was a problem with this site for few days? can I count on it?
Chould I leave it like this now? or put what you suggested.
I tried also to put only what you suggested and it works fine too so what to pick?
By the way - and I have the following filters too that are available :TeX notation and MathJax