<script>
   $(".donate-panel .option").click(function(){
      $(".option").removeClass('selected');
      if ( $(this).hasClass('other') ){
         $(this).addClass('selected');
         $("#amount").val("");
         $("#amount").prop('readonly', false);
         $("#amount").focus();
      }else{
         $(this).addClass('selected');
         var amount = $(this).val();
         $("#amount").val(amount);
         $("#amount").prop('readonly', true);
      };
   });
   $(".btn-gen-paypal").click(function(){
      var amount = $("#amount").val();
      var href = "https://www.paypal.com/cgi-bin/webscr?cmd=_donations&business=administracion@radioecca.org&item_name=Donaciones+Radio+ECCA.+Fundaci%F3n+Canaria&item_number=Donaci%F3n+a+trav%E9s+de+radioecca.org&amount=" + amount + "&currency_code=EUR";    
      
      window.location = href;
   });
</script>