You need to use an onmouseover AJAX action. The onmouseover event is set in the advanced template option "Action events". I'll have to warn you this is usually difficult to get right, unless you are a bit of an expert web scraper and knows how such a website works from a technical point of view.

You cannot create a page area that spans the date, time and program cells, since they are not adjacent HTML elements (although they look to be). They are lists floated side by side.