function load (aCaller, aFile) {
  if ((aCaller.style.cursor !== '') & (aCaller.style.cursor !== 'pointer'))
   return false;
  
  // define content & images
  holder = document.getElementById('content');
  switch (aCaller.id) {
   case 'p1':
    img_01 = '../cmn/l_s.gif';
    img_12 = '../cmn/l_r_s.gif';
    img_23 = '../cmn/l_r.gif';
    img_34 = '../cmn/l_r.gif';
    img_40 = '../cmn/r.gif';
    break;
   case 'p2':
    img_01 = '../cmn/l.gif';
    img_12 = '../cmn/r_l_s.gif';
    img_23 = '../cmn/l_r_s.gif';
    img_34 = '../cmn/l_r.gif';
    img_40 = '../cmn/r.gif';
    break;
   case 'p3':
    img_01 = '../cmn/l.gif';
    img_12 = '../cmn/l_r.gif';
    img_23 = '../cmn/r_l_s.gif';
    img_34 = '../cmn/l_r_s.gif';
    img_40 = '../cmn/r.gif';
    break;
   case 'p4':
    img_01 = '../cmn/l.gif';
    img_12 = '../cmn/l_r.gif';
    img_23 = '../cmn/l_r.gif';
    img_34 = '../cmn/r_l_s.gif';
    img_40 = '../cmn/r_s.gif';
    break;
   default:
    file = './er.html';			
  }
  // set
  holder.src = aFile;
  
  aimg = document.getElementById('i01');
  aimg.src = img_01;
  aimg = document.getElementById('i12');
  aimg.src = img_12;
  aimg = document.getElementById('i23');
  aimg.src = img_23;
  aimg = document.getElementById('i34');
  aimg.src = img_34;
  aimg = document.getElementById('i40');
  aimg.src = img_40;
   
  // ajust outline
  container_name = aCaller.id;	
  for(i = 0; i < document.all.length; i++) {
   o = document.all(i);
   if (o.id == 'p1' || o.id == 'p2' || o.id == 'p3' || o.id == 'p4') {
    if (o == aCaller) {
    	o.style.cursor = 'default';
    	o.style.background = '#FFFFFF';
    	o.style.borderBottom = "none";
    } else {
    	o.style.cursor = 'pointer';		
    	o.style.background = '#C0C0FF';
    	o.style.borderBottom = "solid 2px #808080";
    }
   }
  }
  return true;
}