can't replace image url

query string parameters swapper.js

<script>
// starts to use what we got stored | gets button
	var obj = getCookie();
	var button = document.querySelectorAll("a.elButton");
	// dsk button
	var my_btn = button[0];
	href = my_btn.href;
	href = href.replace(/#prod_geo#/g,obj.prod_geo);
	href = href.replace(/#prod_name#/g,obj.prod_name);
	href = href.replace(/#subprod_name#/g,obj.subprod_name);
	href = href.replace(/#offer_name#/g,obj.offer_name);
	href = href.replace(/#offer_device#/g,obj.offer_device);
	
	// starts to use what we got stored | gets image
	var img = document.querySelectorAll("img.elIMG"); // gets all images on DOM
	// dsk image
	var my_img = img[1];
	dsk_img_href = my_img.dataset.imagelink;
	dsk_img_href = dsk_img_href.replace(/#prod_geo#/g,obj.prod_geo);
	dsk_img_href = dsk_img_href.replace(/#prod_name#/g,obj.prod_name);
	dsk_img_href = dsk_img_href.replace(/#subprod_name#/g,obj.subprod_name);
	dsk_img_href = dsk_img_href.replace(/#offer_name#/g,obj.offer_name);
	dsk_img_href = dsk_img_href.replace(/#offer_device#/g,obj.offer_device);
	
	// trigger the swap
	$("a[href*='#prod_geo#']").attr("href",href);
	$("img[href*='#prod_geo#']").attr("href",dsk_img_href);
</script>