<!-- 

 
mb_mainTrue = new Image(218,87) 
mb_mainTrue.src = "buttons/main.gif " 
mb_mainTruea = new Image(218,87) 
mb_mainTruea.src = "buttons/astronomy.gif " 
mb_mainTrueb = new Image(218,87) 
mb_mainTrueb.src = "buttons/design.gif " 
mb_mainTruec = new Image(218,87) 
mb_mainTruec.src = "buttons/astrophysics.gif " 
mb_mainTrued = new Image(218,87) 
mb_mainTrued.src = "buttons/launch.gif " 
mb_mainTruee = new Image(218,87) 
mb_mainTruee.src = "buttons/l_images.gif " 
mb_mainTruef = new Image(218,87) 
mb_mainTruef.src = "buttons/physics.gif " 
mb_mainTrueg = new Image(218,87) 
mb_mainTrueg.src = "buttons/laboratory.gif " 


function switchImage(imageName, mousePosition) { 
  imgToAlter = eval(imageName + mousePosition + ".src"); 
  document.images[imageName].src = imgToAlter; 
 } 
 
function multiSwitchImage(imageName, mousePosition, imageNum) { 
  imgToAlter = eval(imageName + mousePosition + imageNum + ".src"); 
  document.images[imageName].src = imgToAlter; 
} 

//-->