    jQuery(function() {        
    jQuery( "#txt_start_date" ).datepicker(
        {
            changeMonth: true,
            changeYear: true,
            showOn: 'button',
            buttonImage: 'images/icon_calendar.gif',
            buttonImageOnly: true,
            dateFormat: '<?php $_array=array('d','m','Y');  $replace_array=array('dd','mm','yy'); echo $date_format=str_replace($_array,$replace_array,EVENTS_DATE_FORMAT);?>',
            onClose: function( selectedDate ) {
				$( "#txt_end_date" ).datepicker( "option", "minDate", selectedDate );
			}
        }
    );
    
    jQuery( "#txt_end_date" ).datepicker(
        {
            changeMonth: true,
            changeYear: true,
            showOn: 'button',
            buttonImage: 'images/icon_calendar.gif',
            buttonImageOnly: true,
            dateFormat: "<?php $_array=array('d','m','Y');  $replace_array=array('dd','mm','yy'); echo $date_format=str_replace($_array,$replace_array,EVENTS_DATE_FORMAT);?>,
            onClose: function( selectedDate ) {
				$( "#txt_start_date" ).datepicker( "option", "maxDate", selectedDate );
			}
        }
    );
  });