I think you're seeing a default margin or padding. In a previous issue you posted about, someone suggested you use the CSS reset
and that applies here again. Have a look at this page for an explanation of that.
Your layout depends heavily on absolute positioning. It's unfortunate that DW seems to direct new coders toward using ap, it's much easier to let elements flow naturally. Have a look at the pitfalls of absolute positioning.
Some other things that have been suggested to you
that you still apply.
And, as I'm sure you'll find out ... you should not double post your questions here.
1.2) Do not crosspost- CodingForums.com is divided into various categories. When initiating a thread, always locate the most appropriate category, and post your question only ONCE, in that category. Do not post the same question in multiple categories.