Font's on OS/2

Does anyone have any information on the built-in fonts in OS/2. When using
the following css:

.text {
  font-family: helvetica, sans-serif; font-size:12px; color:#000000
}

or 

.othertext {
  font-family: arial, sans-serif; font-size:12px; color:#000000
}

The displayed fonts look no where near the same as Helvetica or Arial.
Whatever font is substituted is not very legible and the kerning is
terrible.

I would appreciate any insight into Font's on OS/2 and/or CSS on OS/2.

I am testing with Netscape Navigator 4.61 (German) Edition on OS/2.

Thanks,

Jay Snodgrass