function toggleVisibility(linkObj)
{
 var base = $(linkObj).attr('id');
 var summary = $('#'+base+'-summary');
 var content = $('#'+base+'-content');
 var trigger = $('#'+base+'-trigger');
 var src=$(trigger).attr('src');
 if (content.is(':visible')===true) {
   content.hide();
   summary.show();
   $(linkObj).addClass('closed').removeClass('opened');
   $(trigger).attr('src',src.substring(0,src.length-8)+'closed.png');
 } else {
   content.show();
   summary.hide();
   $(linkObj).removeClass('closed').addClass('opened');
   $(trigger).attr('src',src.substring(0,src.length-10)+'open.png');
 } 
 return false;
}

function updateStripes()
{
  $('table.directory tr').
       removeClass('even').filter(':visible:even').addClass('even');
}

function toggleLevel(level)
{
  $('table.directory tr').each(function() {
    var l = this.id.split('_').length-1;
    var i = $('#img'+this.id.substring(3));
    var a = $('#arr'+this.id.substring(3));
    if (l