Problem with date picker

[eluser]Unknown[/eluser]
Hello Guys! I'm having trouble with my date picker. The date picker doesn't show up when I click its designated button. Can you help me with this? Here's my code for it:

Code:

$sod = array('name'=>'sod', 'maxlength'=>'10','size'=>'15', 'readonly'=>'readonly', 'value'=>$this->input->post('sod'));
  $sod_data = array('name' => 'button', 'class' => 'elipses', 'value' => 'true','content' => '...', 'onclick'=>"displayDatePicker('eod', false, 'ymd', '-');");
  $this->table->add_row($this->util->set_label('Start of Development *'),form_input($sod).spacer.form_button($sod_data));
  
  $eod = array('name'=>'eod', 'maxlength'=>'10','size'=>'15', 'readonly'=>'readonly', 'value'=>$this->input->post('eod'));
  $eod_data = array('name' => 'button', 'class' => 'elipses', 'value' => 'true','content' => '...', 'onclick'=>"displayDatePicker('eod', false, 'ymd', '-');");
  $this->table->add_row($this->util->set_label('End of Development *'),form_input($eod).spacer.form_button($eod_data));

Thanks in advance for your help!