Event.observe(window, 'load', function() {

  Event.observe('addBtn', 'click', function() {
  sendData();
  });   
        function sendData()
        {         
         var color1 = $F('firstColor');
         var color2 = $F('secondColor');
         var color3 = $F('thirdColor');

         document.forms.ppForm.os0.value= $F('size');
         document.forms.ppForm.os1.value=(color1 + ', ' + color2 + ', ' + color3);
         resetWindow()
        }         
            function resetWindow() {
            window.location.href=window.location.href;
            }
});