Featured Image URL added into footer script

Is there a way to pull an image url from a query, and have that url echoed into a plugin script that’s in the footer? My problem is that I have a layerslider that needs a static background image. The problem is that the query is ran at the top of the page, so I lose access to the loop by the time the javascript is called in the footer.

I essentially need this:

<script type="text/javascript">
     //Layer Slider
	$(document).ready(function(){
	$('#layerslider').layerSlider({
	globalBGImage: '<?php echo $imagefromloopurlhere; ?>'
    });
});
</script>