Sherif's suggestion should be followed first. If you can get a copy of the template and look at the code that would be one of the best ways. (Of course, I don't need to tell you the #1 best way would be to go back to the backup copy you don't have. I think all of us have regrets related to not having backups we didn't expect to need.)
As I look over the code from checking your site, it looks to me like there may now be some problems with the div structure. It is hard to tell, however.
Since it isn't too long, I would start from the beginning and get the page structured with indents, especially as far as the div's are concerned, so that they line up and you can be sure what level you are on as you look over the content. (Meaning: each div in indented one more that than the previous one, and back out the same way, so you can always tell whether all are opened and closed correctly).
One thing I do see is that you have this piece of code:
<div id="content"> </div>
right after where you think you may have deleted something.
It looks like it should be:
<div id="content">
[CONTENT HERE]
</div>
with your missing content located where indicated. I'm not sure of your template structure but if Wordpress (I don't use so someone else needs to help you out here) is using php includes as it appears to put this stuff in, you could have just deleted a line that looks something like:
include('../includes/contentfile.php');
which is an external file holding your content. If you can point to it you will find whatever you deleted. If something like this is true, in other words, you didn't really delete the content just the include instruction.
There is one small thing that probably shouldn't have any affect, but I wouldn't guarantee anything about code. You have in the middle of your page a line that reads:
<content>
This is the form of an html tag. A as far as I know there is no such code. But this would open it and there is no closing </content> tag on the page. This line may have been intended to be a comment but if so it is incorrect format for that and who knows how a browser would read it.