function showhide(o) {
var fold_image = new Array();
fold_image[0] = "images/downarrow.png";
fold_image[1] = "images/uparrow.png";


if(document.getElementById(o).style.display=='none') {
document.getElementById(o).style.display='block';
 if(document.getElementById('hiding-'+o)) {

document.getElementById('hiding-'+o).src=fold_image[0];
  }
 } else {
document.getElementById(o).style.display='none';

   if(document.getElementById('hiding-'+o)) {
document.getElementById('hiding-'+o).src=fold_image[1];

   }
   }
 
 }