changing default input method

[Xurxo Fernandez Gismero]

I installed french language on my computer. Now the default input method
has changed from UIM to CEDILLE. Without UIM i cannot write in japanese.
In gtk2 apps like evolution or gaim i can left click and change the
input method to UIM, but it doesnt work in Open Office or Firefox.
There must be a way to change it for the whole desktop since UIM is the
default with if i select english or japanese as the language.
Thanks in advance.