I have been offered an "opportunity" to take over maintenance of a small internal website run by my group that provides information about schedules and photos of events the groups done.

My manager sent me the link to the site and checked it out. The site looked clean and neat but loaded in ~5 seconds. I thought this was a little long considering the site really didn't contain a lot of content. This prompted me to take a look under the hood at the pages source code. To my horror it'd been totally hacked together using nested tables!

I'm new so I really can't say no to this "opportunity" so what should I do with it?

Every fiber of my being feels that the only correct thing to do is over hall the site using CSS, Div's, Span's and any other appropriate tags that a sane/good web developer would used to begin with instead of depending on the render incentive magic of tables.

But I'd like to ask programmers with more experienced then me, who have been in this situation. What should I do?

Is my only realistic option to leave the horror as is and only adjusting the content as requested? Is there some kind of middle ground where things can be made better even if they're not perfect?

Thanks ahead of time.