Help about search bar

Hi,
First of all, say thanks to the forum administrator for helping me, I know they have a lot of work.

I have a problem with the search bar in my other web (the problem in the other search bar in the other web was fixed) but in the other web that I have: www.mt2010.es I have the same problem, it only works if I search from home. If I search from another page, it doesn't work and returns the string "Home".
I can't change all the ot_bicylcegreen theme folder because I have changed some things in css and php, like the width of the virtuemart articles...

So please help me, this is the main page and I need it working!
thanks!