Try convert it to TTF and then to .woff, then follow Ashely's tutorial on how to get web fonts implemented. I've never worked with bitmap fonts so sorry if this is a bit obscure, I'm just speaking from using TTF and converting to woff.
That's a good advice, BUT if the bitmap fonts have unique styles like shadows, gradients, textures, etc. .tff and .woff fonts don?t help.
I was thinking to create a sprite with multi frames like 0=A 1=B 2=C...
The biggest problem is how to type a text with bitmap fonts...