if (document.links) {
   var new_shop = 1;
   var cur_href = '';
   var linklist = document.links;
   for (x=0; x < linklist.length; x++) {
      cur_href = String(linklist[x].href);
	  switch (new_shop) {
	     case 4: linklist[x].href = cur_href.replace(/\/cat-usa-usd\//,'/cat-eu-eur/'); break;
	     case 8: linklist[x].href = cur_href.replace(/\/cat-usa-usd\//,'/cat-gb-gbp/'); break;
	  }
   }
   document.buy_form.s.value = new_shop;
}