php help – widgets and sidebars

So…

Why can’t I get the same widget to appear on 2 sidebars?

Let’s say there’s a widget in my functions.php file that looks like this:

function skyscraper_widget() {
	echo '
		<div id="sky-ad" class="widget">'
SOME ADD CODE GOES HERE
		'</div>';
}
wp_register_sidebar_widget('skyscraper_widget', __('Sidebar Ads'),  'skyscraper_widget');

It seems to appear under “Available WIdgets” in the widget screen and I can drag it to a sidebar and then it works. Great. But now it’s not available for a second sidebar! Why is that?

I figured out by trial and error that I could create widgets by copying some of those functions and then changing the names. So If I do this:

function skyscraper_widget2() {
	echo '
		<div id="sky-ad" class="widget">'
SOME ADD CODE GOES HERE
		'</div>';
}
wp_register_sidebar_widget('skyscraper_widget2', __('Duplicate Sidebar Ads'),  'skyscraper_widget2');

Now I get a duplicate, it’s available, and I can drag it to my second sidebar.

I assume what I’m doing here is an ugly hack right? What’s the correct way to do this?