So here''s how it is: I have a bunch of isometric tiles that are 200 pixels wide and 99 high. They fit and everything, but i need to know how to make them seamlessly fit together. Its somewhat complicated so I''d appreciate any help i can get. Thanks

I am not sure if I understand your question but if you mean how to make horizontal tiles "touch" each other as well as the vertical ones, so there is no gap between 2 tiles, what I did is make the tiles 60x30 usning the last horz line too, so, the central horz line is repeated, then you blit as normal, tiles overlap by one pixel, but looks good, and you dont get the gap.
sorry to rush it, but I am at work

--------------------------------------------------------
"When you say ''I wrote a program that crashed Windows'',
people just stare at you blankly and say
''Hey, I got those with the system, *for free*''."

Linus Torvalds.