JQuery problem

I changed a small script last night that is supposed to perform an asynchronous call and fill in the div via AJAX.

I changed the following code:

function getColAvg(sUser, dtData){	
$('#DivColAverages').html('<div align="center"><img src="images/ajax-loader.gif" /></div>');
jQuery.ajax({
	type: "GET",
	url: "options.php?option=ColAvg&dataDate=" + dtData + "&User=" +sUser,
	dataType: "html",
	success: function(response){
		$('#DivColAverages').html('');
		$('#DivColAverages').html(response);
	},
	error: function(){
		//alert("Error occured during Ajax request...");
	}
});		

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to permit the addition of a unique suffix to the div ID so that I can have more than 1 of these on the page.

function getColAvg(sUser, dtData, unq=''){	
var divA = document.getElementById('DivColAverages' + unq);
divA.html('<div align="center"><img src="images/ajax-loader.gif" /></div>');
jQuery.ajax({
	type: "GET",
	url: "options.php?option=ColAvg&dataDate=" + dtData + "&User=" +sUser,
	dataType: "html",
	success: function(response){
		var divA = document.getElementById('DivColAverages' + unq);
		divA.html('');
		divA.html(response);
	},
	error: function(){
		//alert("Error occured during Ajax request...");
	}
});		

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And ... it no longer does the call, as far as I can tell. Firebug permits me to see that line 3 executes, but after execution the div code remains
 

<div id="DivColAverages" class="f_r_f_p_body">
<script>
getColAvg('SCAM','11/28/2014');
</script>
</div>

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Where am I messing this up?  Thanks!