Help needed on webdesign, logo's, dynamic charts, etc.

Question

This is my first post here on this forum, so forgive me for maybe not giving you all the relevant data.
Background
Bill Gehrke and myself have developed a benchmark test for Premiere Pro CS5. Look here: PPBM5 Benchmark
Since last week I have made this site, the very first in my life with Dreamweaver CS4. It was the first time I used DW and let me tell you, for a PR user, it is really a whole lot different.
Workflow
People go to the site, follow the Benchmark Instructions, download the ZIP file, run the test and mail the results to us.
We enter the data in a Excel spreadsheet and export that to .HTML format and upload it to the site. This can be seen in the Benchmark Results.
Questions
Here is a screenshot of the spreadsheet:
There are three cells of interest: A2 which is a link to the Home Page, and M1 and M2, which link to two separate JPG charts.
What I want on the published HTML results page is overlaying the cell A2 with a logo, like on all other pages, but keep the current link underneath the logo intact to return to the Home page. Of course without impacting the layout of the spreadsheet. When trying to insert the logo, it looks like this in Live View, and that is not what I want. Look at the problem:
Second I want a Spry tooltip on the links to the charts, or another solution, that when one hovers the mouse on either field, it will display the linked to chart over the spreadsheet, untill the user moves the mouse away. One could also consider an overlayed thumb file of the chart, that automatically will be enlarged to full size with the Tooltip.
The complicating factor is of course that when new results are submitted and a new HTML file is created, it does not require new coding.
I have tried to do the overlays in Excel, but the export to HTML from Excel is pretty weak, and the overlayed pictures that show up fine in Excel, do not show up in DW or the site after uploading. One other complicating factor in Excel is that overlays disable the underlying link.
I hope this explains what I want to do. Maybe some of you, far more knowledgeable and experienced, have some suggestion on how to tackle this.

Answer 1

Ben & PZ,
Thanks in large part to your help and suggestions, I have solved the major issues I had.
First, I don't want to give the spreadsheet out to people, so downloading is out of the question. There is just too much error checking code, formulas, logic and formatting and numerous macros in the spreadsheet, that I consider that as proprietary and even though there are ways to protect the contenct of a workbook, it is just too easy to circumvent.
People will have to do will the large table of results, but the essential information is shown in such a way that horizontal scolling is hardly necessary. Vertical scolling will become necessary when there are more entries, like the around 150 entries in the PPBM4 benchmark for CS4, but that can't be helped.
I tried your suggestions, one step at a time, and had a couple of problems, in the sense that several footnotes, that were automatically added to several columns based on the content of other columns, were lost. For instance, when someone says he has a SATA disk, but it runs at 10,000 RPM and the size is either 150, 300 or 600 G, it is a Velociraptor and the interface is changed to SATA1 with the 1 as a supercript. In combinations with the difficulty I envisioned with the complete reformatting of the table in HTML, I searched for alternative approaches, and I found it.
With the help of Lightbox, I now have the two charts I want to show available, it looks pretty good, although I had to adjust the position of the charts in the lightbox.js file.
You can see the result here: http://ppbm5.com/Benchmark5.html
Now the only thing to figure out is the logo, but that is secondary.
Thank you both for your help and suggestions. As a consequence, I have learned a lot and made another step forward.