I'm a realtor & can't access MLS through Safari...

Hi everyone, I just bought a new macbook (2ghz) and didn't realize that my local MLS system wouldn't work through safari. I can access some of the features of the website but I can't perform searches (fairly important!). By doing a little research online it seems that the website is designed to work with internet explorer. Some websites say that there are ways you can get it to work but then they offer no explanations so I'm not sure if it's just a hoax...the website is www.ntreis.net if that helps anybody. Hopefully someone can offer me a solution! I really don't want to spend a bunch of money on extra software. Thanks in advance!