function $(el) {
  return document.getElementById(el);
}
Behaviour.register({
  '.more' : function( el ) {
    el.onclick = function() {
      this.style.display = 'none';
			$( el.id + '_box' ).style.display = 'block';
			return( false );
		}
	},
  '.less' : function( el ) {
    el.onclick = function() {
      $( el.id.replace( /less/, 'more' ) ).style.display = 'inline';
      $( el.id.replace( /less/, 'more' ) + '_box' ).style.display = 'none';
	    return( false );
    }
	}
});