Losing Code

When I upload my Code to overwrite an exsisting file...i'm losing some of the code. here is an example of what I mean:

here is the code i put in:

TD align="center"><a href="art/001.jpg"><img src="art/small/001.jpg" alt="" width="120" height="60" border="0">[/url];

but when I view my page on line nothing is coming up. Then when I "view source" I can see that for some reason the Img code is being lost and it looks like this:

TD align="center"><a href="art/001.jpg">

I've tried everything I can think of....can anyone help? Thanks.