Problem when submiting values from re-writen URL

HI,

I am facing problem while submiting the values from the re-writen URL.

for example :
Originale URL : www.website.com/links.php?id=21
re writen url : www.website.com/21.html

when I am submiting the values, the following is the new URL

new url : www.website.com/21.html?comments=test

how can i get the submited values. I am not sure how to handle this situation. Please help me.

 

Please help me to solve this problem.