Can anyone change the .htaccess file in 2.5.8 or 3.0.3 to Zeus rewrite.script

i've tried but it doesnt work
e.g for the mortgage calculator link

RULE_1_START:
match URL into $ with index.php?action=calculator&popup=yes
if not matched then goto RULE_1_END
set SCRATCH:ORIG_URL = %{URL}
set URL = calculator.html
match SCRATCH:ORIG_URL into % with \?(.*)$
if matched then set URL = %{URL}&%1
RULE_1_END:

I cannot work out why it does not work, i'm pretty dumb. Will pay for file that works with OR on Zeus server.