Escape characters

[Alhambra Eidos Kiquenet]

Hi all misters;

I have an ASP.NET application, another program (EXE PowerBuilder) calls my
..aspx using http, by URL.

The program "escape" url using javascript function: escape.

when I use escape() javascript function, I get , for example, this:

Observaciones%3DReenvio%20solicitado%3A%20cami%F3n%20co%F1o%20%

But another source code , I have been the special character is %u00xx not %xx

Any help about it ? thanks in advance.