// these are extentions to the scriptaculous effects
	// they assumes that scriptaculous and prototype have been referenced
	Effect.BlindLeft = function(element) {
	  element = $(element);
	  element.makeClipping();
	  return new Effect.Scale(element, 0,
			    Object.extend({ scaleContent: false,
			      scaleY: false,
			      scaleMode: 'box',
			      scaleContent: false,
			      restoreAfterFinish: true,
			      afterSetup: function(effect) {
			        effect.element.makeClipping().setStyle({
			          height: effect.dims[0] + 'px'
			        }).show();
			      },
			      afterFinishInternal: function(effect) {
			        effect.element.hide().undoClipping();
			      }
			    }, arguments[1] || { })
			  );
			};

	
	Effect.BlindRight = function(element) {
	  element = $(element);
	  var elementDimensions = element.getDimensions();
	  return new Effect.Scale(element, 100, Object.extend({
	    scaleContent: false,
	    scaleY: false,
	    scaleFrom: 0,
	    scaleMode: {originalHeight: elementDimensions.height, originalWidth: elementDimensions.width},
	    restoreAfterFinish: true,
	    afterSetup: function(effect) {
	      effect.element.makeClipping().setStyle({
	        width: '0px',
	        height: effect.dims[0] + 'px'
	      }).show();
	    },
	    afterFinishInternal: function(effect) {
	      effect.element.undoClipping();
	    }
	  }, arguments[1] || { }));
	}