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jsPROD & jsCTGY:
createCookie('lastPage', window.location.href, 0);

<mvt:if expr="g.request_cookies:lastPage">
  <a href="&mvt:global:request_cookies:lastPage;" title="Continue Shopping" class="button button-medium button-small-font bg-transparent blue montserrat" id="continue-shopping-link"><span data-icon="&#x44;"></span> Continue Shopping</a>
<mvt:else>
  <a href="http://&mvt:global:domain:name;/" title="Continue Shopping" class="button button-medium button-small-font bg-transparent blue montserrat" id="continue-shopping-link"><span data-icon="&#x44;"></span> Continue Shopping</a>
</mvt:if>

// ---- Cookie Monster ---- //
	function createCookie(c,d,a){if(a){var b=new Date;b.setTime(b.getTime()+864E5*a);a="; expires="+b.toGMTString()}else a="";document.cookie=c+"="+d+a+"; path=/"};
	function readCookie(b){for(var b=b+"=",d=document.cookie.split(";"),c=0;c<d.length;c++){for(var a=d[c];" "==a.charAt(0);)a=a.substring(1,a.length);if(0==a.indexOf(b))return a.substring(b.length,a.length)}return null};
	function eraseCookie(a){createCookie(a,"",-1)};