title: validation in text boxes using datepicker
body: <p>I have three textboxes,
  box1-filled by user1
  box2-filled by user2
  box3-filled by user3</p>
  
  <p>I have also a default value for these three boxes.
  1.Now when box1 is selected user1 cannot input dates before the default date and it should not be allowed to select dates more than in box2(if not blank,otherwise default date is considered).
  2.user2 can enter dates in the range of box1 and box2.
  if these boxes are empty,default will be considered.
  3.user3 can enter date after the dates in box2.</p>
  
  <p>pls can you suggest some solution,as i am new to this technology.
  thnx in advance</p>