Question : How to retrieve a PASSWORD from MySQL database field?

I have a database with email addresses and passwords used fro authorization.   I would like to transfer from my database on my local computer to an offsite database.  How do I transfer the encryted password?  When I put them into the remote database they do not work.  I'm assuming the encrytion is different from one MySQL server to another.  

If it's not possible, can you suggest a system where I can decrypt?  I'm using PHP.

Thanks

Answer : How to retrieve a PASSWORD from MySQL database field?

Ah addition...
if the Mysql authentication is successful you could write down the user password directly in Oracle without the need for chaning

So basicly my app would do something like this

Check Oracle table to see if this user has set password  
If yes check login against Oracle
If no then check login again MySQL    
       IF succesfull  write down the  password from login to Oracle
       if unsuccesfull denied access and offer to reset password  in which case reset password would be written in Oracle