OK I have got home now and now that I can try you page in both IE and Firefox the actual problem is more obvious.
I have the solution too :D
The problem is that when you change image[n].src the new image is not loaded, Firefox and Netscape in response to this seem to load the image where as IE does nothing. The reason it works at home is that nothing needs loading, it is already there.
The solution to you problem is to preload the images, you can do this with this code
-
<script type="text/javascript">
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<!--
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if (document.images)
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{
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image1 = new Image(500, 116);
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image1.src = "conc1.jpg";
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}
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//-->
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</script>
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Which I inserted into the head.
I have uploaded a cut down example of your page to
http://www.puttingdownroots.me.uk/~e.../timeline.html with this modification and it appears to work.
On a styling issue if you are hand writing you pages then you should probably lay out you files in a more readable format. This makes find problems know and future maintenance. The sort of layout I use is
[html]
<html>
<head>
<title>Page title</title>
<meta ... >
</head>
<body>
<table>
<tr>
<td>
content
</td>
</tr>
</table>
</body>
</html>
[/html]
Using tabs instead of spaces stops the whitespace taking too much actual space, I don't stick rigerously to this but putting in enough whitespace to make the code reable is worth it in the long run.
Of course if you used a wysiwyg editor to create your page ignore all that waffle.
If you are dabbling with CSS then put a DOCTYPE at the top of your HTML files. This will force browsers into standards complient mode and make the all act morte similarly in the way the interpret the CSS. Without it they all run in quirks mode (and if it's IE it's very quirky) where the tend to implement there own individual behaviour.
You can find examples of all the normal DOCTYPEs at
http://www.w3.org/QA/2002/04/valid-dtd-list.html. I would recomend HTML 4.01 or XHTML 1.0 TRANSITIONAL to start with as they are the loosest specifications and allow you to get away with the most. Move onto the STRICT doctypes later.
While your at W3C site why not use there HTML validator at
http://validator.w3.org. Unfortunately you current page has 94 validation errors.
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