How to keep Popup Calendar visible on NextPrev Month selection

 Hi,
  I'm working on a form page that will have a calendar.  My problem is as enduser select the Next or Previous Month the Calendar disappear/hide.  I would like the Calendar to remain visible on Next and Prev month selection.   As you can see in the below code the script that is in bold is an attempt I written to force the Calendar to stay visible but its not working.  I tried writing code using the Page Load sub event but that also did not work (I may have written the Page Load code incorrect).  Any help from great minded code head will be appreciated.

 
 <style type="text/css">
    .contentBox{
        border:1px solid #317082;
        height:0px;
        visibility:hidden;
        position:absolute;
    &nb ...