[Plugin: AnythingSlider for WordPress] Removing style tag from inside BODY

I’m trying to remove <style> tags from output, because style tags should not be in body, and add them in the wp_head.
Here is original piece of code:

$output .="
<style>
  #slider-{$id} { width: {$width}px; height: {$height}px; }
</style>
";

So I’m trying to hook following function to add style tag in wp_head, but problem is that variables $id and $width cannot be passed into the function.

function add_slide_style() {
	echo '<style>';
	echo '#slider-{$id} { width: {$width}px; height: {$height}px; }';
	echo '</style>';
}

Has anyone tried something like that?

https://www.ads-software.com/extend/plugins/anythingslider-for-wordpress/