So i've looked at:
http://forum.ppcgeeks.com/showthread.php?t=101578
But for some reason that just didn't work or the reg edit didn't stick etc - but i finally got it! Look at the reg edits below:
USE THE QUOTES!
HKEY_LOCAL_MACHINE\Software\Microsoft\Shell\Rai\: DEFBROWSER
"0"=Opera Mini 5
"1"="\Program Files\Opera Mini 5\OperaMini5-WM-armv4i.exe\"
HKCR\http\Shell\Open\Command\Default and I did it for backup to:
"\Program Files\Opera Mini 5\OperaMini5-WM-armv4i.exe" "%1"
Hope it helps!