MIPS assembly help

I know in MIPS assembly that BGTZ is "branch to [blah] if [blah] is greater than zero", but I disassembled something and it had BGTZL with the correct BGTZ syntax... what is this?
I want to edit it to branch unconditionally.

EDIT: Looks like I was looking at an ancient MIPS instruction set. BGTZL is almost the same thing...

Anyway, it seems that there is no such thing as an "unconditional branch". Would jump work?

EDIT 2: Does anyone recommend a good disassembler that I can "reassemble" the file with?