I have a serious problem getting the datepicker work properly.

I made an html project and put in a zebra_datepicker jQuery plugin. I've created an index page containing 3 textboxes :

1 textbox as a datepicker-start

1 textobx as a datepicker-end

1 empty textbox

I can select the start date and the end date but I cannot move the focus to the empty textbox after selecting the end date. 

Please somebody help me since I'm relatively new to jQuery