well you wont be able to make one like the heaven games ones.
but there should be an upload file button in the place you edit text boxes if you have a simplistic web editor.
if not try freewebs.com , make an account and use it to store files. when you edit a text box you can easilly add files. (it should be able to hold about 10 maps per account if you need more space make another account and just keep adding links on your main site.)
Out Reach
The guy who writes the erotic fan fiction in Yeebaagoon's signature