if (document.images)
   {
	 
     homeOn= new Image(108,37);
     homeOn.src="images/nav/homeOn.gif"; 
     
     spaceOn= new Image(182,37); 
     spaceOn.src="images/nav/spaceOn.gif";
     
     managementOn= new Image(161,37); 
     managementOn.src="images/nav/managementOn.gif";
     
     findOn= new Image(146,37); 
     findOn.src="images/nav/findOn.gif";
     
     contactOn= new Image(163,37); 
     contactOn.src="images/nav/contactOn.gif";
     

     
     
     homeOff= new Image(108,37);
     homeOff.src="images/nav/homeOff.gif";
     
     spaceOff= new Image(182,37);
     spaceOff.src="images/nav/spaceOff.gif";
     
     managementOff= new Image(161,37);
     managementOff.src="images/nav/managementOff.gif";
     
     findOff= new Image(146,37);
     findOff.src="images/nav/findOff.gif";
     
     contactOff= new Image(163,37);
     contactOff.src="images/nav/contactOff.gif";
     
     
     
   }

function lightup(imgName)
 {
   if (document.images)
    {
      imgOn=eval(imgName + "On.src");
      document[imgName].src= imgOn;
    }
 }

function turnoff(imgName)
 {
   if (document.images)
    {
      imgOff=eval(imgName + "Off.src");
      document[imgName].src= imgOff;
    }
 }