Help with CSS/javascript Color format problem with Mozilla...

Okay, here is my problem :

I added a "color selector" to the my PunBB, but I have a somewhat annoying "bug" with Mozilla.

With IE when I click on a color, it adds the Hex Color Value (extracted from backgroundColor) correctly in the textarea like this :

But with Mozilla, it adds RBG Color Value instead!!

Does anyone knows how I could fix this?

Here's the .js code (ah... and I forgot something -> I use PunBB+ with PunBB 1.1.2 "upgrade" )

function C(obj){
    var color;color=(obj.style)?obj.style.backgroundColor:obj.backgroundColor;
        formatThis('[color='+color+']', '[/color]');
}

and the function is called from each "colored" TD element (whom id property is set to "c0", "c1", ... "c35" - 35 colors available) with the onclick event handler :

C(this); //short isn't it? -> it was intended to be short

EDIT: Thanks anyway if you don't find a solution (I managed to wolve the problem now)

But I am still wondering if anybody had the same "problem" or if there was a "built-in feature" I didn't know that might had helped me a bit (why Mozilla had to convert Hex values to "rbg"? o_O This is really weird! No one would ever use those in HTML!