You should upload your web pages using a File Transfer Application such as Fugu for the Mac or WinSCP for the PC.

Information on how to use these programs can be found here:

http://www.columbia.edu/cuit/software/filetransfer.html

When you do connect, you should connect to cunix.cc.columbia.edu.

You may also want to look at the following instructions to ensure that files that are transferred are world viewable:

For WinSCP:

http://www.columbia.edu/cuit/software/winscp/using-winscp.html#web

For Fugu:

http://www.columbia.edu/cuit/software/fugu/fugu-basics.html#info