I found on Google, that it does have drivers for Mac OS X:
http://www.dell.com/content/products/productdetails.aspx/printer-dell-1235cn?c=u s&cs=19&l=en&s=dhs&~tab=specstab
under the compatible client operating systems:
Microsoft® Windows® 2000/2003/XP/Windows Vista® / 2008, MacOS: 10.3~10.5
10.4.7, which is in your profile falls within that range. And the fact 10.3 is mentioned says they have PowerPC drivers in addition to Intel drivers, which says 10.4.7 likely is supported. If the CD doesn't support it, and you can't find the Drivers on Dell's website, point them to that spec page and ask them to find out who wrote that spec page to find out where the drivers are on their website. Dell may have also remarketed a driver engine that does have Mac OS X compatible drivers from another manufacturer. That could also be the case here and would be a question for Dell tech support.