Security Basics: MD5-Hash of a SHA-1-Hash unsecure?

["Andre Pawlowski" <sqall () h4des org>]

Hey guys,

I've written a program which can store files encrypted (  
http://h4des.org/index.php?inhalt=kastalia ). The user enters a  
password when he wants to encrypt a file. The programm makes a  
SHA-1-Hash of this password and transfers it from the browser to the  
server. When the encryption starts, the program makes a MD5-Hash of  
this SHA-1-Hash for the IV of the blowfish algorithm.
Here is my question: Is it less secure when I make a MD5-Hash of a SHA-1-Hash?

Regards,

--
[] Andre Pawlowski

visit http://h4des.org