how would i set up my webpage so that the content in a specific table, read from a different file depends on what you click on?

You can't, as far as I know. Each document calls from 1 CSS document. However, if you want to create different table setups, why not just create additional tags with unique ID's? For example:

.table1 {align: left; background-color: #FF0000; border: 0}
.table2 {align: right; background-color: #E8B900; border: 3}

And then in your document, do the following:

<table class="table1">...</table>
<table class="table2">...</table>

[edit: glaring CSS error, fixed now]

nono... sorry if i explained it wrong

lets say i have a main.php and i click on a link and it goes to main.php?action=blah.php or something like that and the data in a part in main.php changes.

I prefer this way:
1) make your link like that:
<a href=main.php?content=yourpage>Your link</a>
2) in main.php place tyhe following code
<?include ($content.php);?>

On different links your souhld place a different "content"...

thanks alot, but what do i put in the content.php page

There should be no "content.php" file. Explaining: you want part of data on your page to change, right? "$content" is a varaible which will contain name of your page. For example, "data1.php" will contain one variant of your data. "data2.php" will contain another part. So you'll got to links:

<a href=main.php?content=data1>Main page with data1</a>

<a href=main.php?content=data2>Main page with data2</a>

in "main.php":
<?include($content.php);?>

If you click 1st link you will go to main page, containing data1. If you click 2nd link you'll go to main page, but it will contain data2...

ok thanks alot that makes more sence =]

If he doesn't have global variables setup he'll need to specify $content by saying:

$content = $_GET['content'];