function oshop_add_to_cart(amount, productId) {
  
  var a = $.get( "?__ajaxMethod=ajax_oshop_add_to_cart"
               , { amount:    amount
                 , productId: productId
                 }
               , function(data, textStatus) {
                 }
               );

}

function oshop_remove_from_cart(productId) {
  
  var a = $.get( "index.html?__ajaxMethod=ajax_oshop_remove_from_cart"
               , { productId: productId
                 }
               , function(data, textStatus) {
                 }
               );

}

function oshop_add_product_shipping(productId) {
  
  var a = $.get( "?__ajaxMethod=ajax_oshop_add_product_shipping"
               , { productId: productId
                 }
               , function(data, textStatus) {
                 }
               );

}

function oshop_remove_product_shipping(productId) {
  
  var a = $.get( "index.html?__ajaxMethod=ajax_oshop_remove_product_shipping"
               , { productId: productId
                 }
               , function(data, textStatus) {
                   cms_page_refresh();
                 }
               );

}