function addmShopperJS(name){
 head=document.getElementsByTagName('HEAD')[0];
 mShopperJS=document.createElement('script');
 mShopperJS.type='text/javascript';
 mShopperJS.src=name;
 head.appendChild(mShopperJS);
}

addmShopperJS("https://www.mshopper.net/mstore_redirect.js?merchantId=470");