External link to accordion button

I’m new at HTML and JavaScript and I’m kind of totally lost, but I need a fast solution…

I created a website with some accordion buttons and what I would need is to open one specific accordion by clicking a link on an external website.
I read a lot into it, but it’s way over my skill level :confused:

What I got is that if you use an url link like www.domain.com/index.html?xyz you can create a javascript to “click” the accordion button for you. At least that’s one solution.
Like I said: I’m totally lost and helpless, but I need a solution fast and I’m hoping somebody can help me.

The HTML I have is:

<button class="tablink" id="defaultOpen" onclick="openPage('Home', this, 'transparent')">Home</button> 
<button class="tablink" onclick="openPage('Downloads', this, 'transparent')">Downloads</button> 
<button class="tablink" onclick="openPage('TracerSettings', this, 'transparent')">Tracer Settings</button> 
<button class="tablink" onclick="openPage('Contact', this, 'transparent')">Contact</button> 
<button class="tablink" onclick="openPage('Impressum_Datenschutz', this, 'transparent')">Impressum & Datenschutz</button> 

	<div class="tabcontent" id="Downloads">
					<h1 class="PageTitel">Downloads und Software</h1>

For every button I a div with the ID of the button.

The JavaScript I’m using for the accordion:

function openPage(pageName, elmnt, color) {
	// Hide all elements with class="tabcontent" by default */
	var i, tabcontent, tablinks;
	tabcontent = document.getElementsByClassName("tabcontent");
	for (i = 0; i < tabcontent.length; i++) {
		tabcontent[i].style.display = "none";
	// Remove the background color of all tablinks/buttons
	tablinks = document.getElementsByClassName("tablink");
	for (i = 0; i < tablinks.length; i++) {
		tablinks[i].style.backgroundColor = "";
	// Show the specific tab content
	document.getElementById(pageName).style.display = "block";
	// Add the specific color to the button used to open the tab content
	elmnt.style.backgroundColor = color;
// Get the element with id="defaultOpen" and click on it

It would be really great if somebody could help a small beginner and might be able to explain it to me.

Thanks a lot!

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