function showPic (whichpic) {
if (document.getElementById) {
document.getElementById('placeholder').src = whichpic.href;
  return false;
 } else {
  return true;
 }
}

function prepareGallery(){
  if( document.getElementById &&
      document.getElementsByTagName ){
    if( document.getElementById( 'project_thumbs' ) ){
      var gallery = document.getElementById( 'project_thumbs' );
      var links = gallery.getElementsByTagName( 'a' );
      for( var i=0; i < links.length; i++ ){
        links[i].onclick = function(){
          return showPic(this);
        };
      }
    }
  }
}