OnLoad condition based on web address

I am using an expandable and collapseable menu on my site. In the body tag I can use the OnLoad command to tell the menu which category I would like open. However, I am using the same menu on multiple pages and want the OnLoad to be dynamic based on what the web address is. I can't put the OnLoad on each page becuase those pages are dynamic as well and one file can be many different pages. Is there a way to set a function based on what the web address is and then use that in that function in the OnLoad.

I was told to maybe try this:

$page = $_SERVER['PHP_SELF'];
if ($page = index.php) {
menu_a
}
if ($page = contact.php) {
menu_b
}


Would that work and then if it does what would I put in the OnLoad command?

OnLoad=('$page');

????

Is correct?

It depends on what language you want to use because the one you posted was PHP and this is the Javascript forum, so which language would you prefer to use?

In principle:-


<script type = "text/javascript">
var winloc = window.location.href;
if (winloc == "index.php") {
do this (menu A)
}
else {
dothat (menu B)
}
</script>