/*
window.addEvent('domready', function(){
    if ( $('ShoppingForm') ){

        $$('div#ShoppingForm form')[0].addEvent('submit', function(ev){
            var evnt = new Event(ev);
            var valid = true;
            $$('div#ShoppingForm select').each(function(el){
                if (el.value == 0) valid = false;
            });

            if (!valid){
                alert('Please select the quantity');
                evnt.stop();
            }

        });

        $('idbutton').addEvent('click',function(ev){
            var evnt = new Event(ev);
            var valid = true;

            $$('div#ShoppingForm select').each(function(el){
                if (el.value == 0) valid = false;
            });

            if (valid){
                $$('div#ShoppingForm form')[0].submit();
            }else{
                alert('Please select the quantity');
            }
        });
    }

});
*/