jQuery(document).ready(function()  {
  if(jQuery('#variantaProduktu').length>0) {
    jQuery('#variantaProduktu').change(function()  {
        var idVarianty = jQuery(this).val();
        window.location.href = '?id_varianty='+idVarianty;
      	//console.log(jQuery(this).val());
    });
  }
});