if (document.images) 

          {

          ImageOneNormal = new Image;

          ImageOneNormal.src = "buttons/epidemiology.jpg";

          ImageOneChanged = new Image;

          ImageOneChanged.src = "buttons/epidemiology-over.jpg";

          

ImageTwoNormal = new Image;

          ImageTwoNormal.src = "buttons/strucfunc.jpg";

          ImageTwoChanged = new Image;

          ImageTwoChanged.src = "buttons/strucfunc-over.jpg";

          

ImageThreeNormal = new Image;

          ImageThreeNormal.src = "buttons/infection.jpg";

          ImageThreeChanged = new Image;

          ImageThreeChanged.src = "buttons/infection-over.jpg";

          

ImageFourNormal = new Image;

          ImageFourNormal.src = "buttons/path.jpg";

          ImageFourChanged = new Image;

          ImageFourChanged.src = "buttons/path-over.jpg";

          

ImageFiveNormal = new Image;

          ImageFiveNormal.src = "buttons/immresp.jpg";

          ImageFiveChanged = new Image;

          ImageFiveChanged.src = "buttons/immresp-over.jpg";

         

ImageSixNormal = new Image;

          ImageSixNormal.src = "buttons/tx.jpg";

          ImageSixChanged = new Image;

          ImageSixChanged.src = "buttons/tx-over.jpg";

          

ImageSevenNormal = new Image;

          ImageSevenNormal.src = "buttons/vaccines.jpg";

          ImageSevenChanged = new Image;

          ImageSevenChanged.src = "buttons/vaccines-over.jpg";

          
 

ImageEightNormal = new Image;

          ImageEightNormal.src = "buttons/whole.jpg";

          ImageEightChanged = new Image;

          ImageEightChanged.src = "buttons/whole-over.jpg";

          

ImageNineNormal = new Image;

          ImageNineNormal.src = "buttons/ab.jpg";

          ImageNineChanged = new Image;

          ImageNineChanged.src = "buttons/ab-over.jpg";

          

ImageTenNormal = new Image;

          ImageTenNormal.src = "buttons/vlp.jpg";

          ImageTenChanged = new Image;

          ImageTenChanged.src = "buttons/vlp-over.jpg";

          

ImageElevenNormal = new Image;

          ImageElevenNormal.src = "buttons/dna.jpg";

          ImageElevenChanged = new Image;

          ImageElevenChanged.src = "buttons/dna-over.jpg";

          

ImageTwelveNormal = new Image;

          ImageTwelveNormal.src = "buttons/animal.jpg";

          ImageTwelveChanged = new Image;

          ImageTwelveChanged.src = "buttons/animal-over.jpg";

          


ImageThirteenNormal = new Image;

          ImageThirteenNormal.src = "buttons/outbreaks.jpg";

          ImageThirteenChanged = new Image;

          ImageThirteenChanged.src = "buttons/outbreaks-over.jpg";

 


ImageFourteenNormal = new Image;

          ImageFourteenNormal.src = "buttons/bt.jpg";

          ImageFourteenChanged = new Image;

          ImageFourteenChanged.src = "buttons/bt-over.jpg";

 


ImageFifteenNormal = new Image;

          ImageFifteenNormal.src = "buttons/challenges.jpg";

          ImageFifteenChanged = new Image;

          ImageFifteenChanged.src = "buttons/challenges-over.jpg";

 


ImageSixteenNormal = new Image;

          ImageSixteenNormal.src = "buttons/resources.jpg";

          ImageSixteenChanged = new Image;

          ImageSixteenChanged.src = "buttons/resources-over.jpg";

 


ImageSeventeenNormal = new Image;

          ImageSeventeenNormal.src = "buttons/refs.jpg";

          ImageSeventeenChanged = new Image;

          ImageSeventeenChanged.src = "buttons/refs-over.jpg";

 


}



function ChangeTheImage(imgName) 

 {

  if (document.images)

   {

     ChangedImage = eval(imgName + "Changed.src");

     document[imgName].src = ChangedImage;

    }

  }



function ChangeItBackAgain(imgName) 

  {

   if (document.images) 

    {

     NormalImage = eval(imgName + "Normal.src");

     document[imgName].src = NormalImage;

    }

  }