anchor.diff:  		$(".week_days").css('display', (value > 4 ? 'inline' : 'none'));
   		$(".days").css('display', (value > 6 ? 'inline' : 'none'));
   		
  +    $('#zoom_slider').slider('option', 'value', value);
  +
   		var width, border;
   		
   		switch(value) {
  
positive.code:   }
    
    // set default zoom and scroll to today
    $('#zoom_slider').slider('option', 'value', '7');
    update_calendar_zoom(7);
  	
    var todayCol = $('td[data="<%= Date.today.strftime('%Y-%m-%d') %>"]');
    var scrollArea = $('#staff_calendar_scroll');
    if (todayCol) {
  
negative.code: 		});
  		
    function zoom(incr) {
      update_calendar_zoom($('#zoom_slider').slider('option', 'value') + incr);
    }		
    
    function update_calendar_zoom(value) {
  