Internet Explorer options for PowerPC Mac

I needed another computer at work strictly for internet browsing, so I decided I could save a few bucks by upgrading my old, dust-gathering 1st gen mac mini (powerpc) to 1 gig ram and OS 10.4.11 (instead of buying a new desktop). However, there is a crucial website that I need to use for work, but it operates only on an IE browser (version 5.5 or better). Do I have any options either with bootcamp, or some other software? thanks