// Do rollover images
px1on= new Image(112,50);
px1on.src="homeon2.jpg";  
px1off= new Image(112,50);
px1off.src="homeoff.jpg";

px2on= new Image(112,50); 
px2on.src="planeton2.jpg"; 
px2off= new Image(112,50);
px2off.src="planetoff.jpg";    

px3on= new Image(112,50); 
px3on.src="historyon2.jpg"; 
px3off= new Image(112,50);
px3off.src="historyoff.jpg";    

px4on= new Image(112,50); 
px4on.src="roboton2.jpg"; 
px4off= new Image(112,50);
px4off.src="robotoff.jpg";    

px5on= new Image(112,50); 
px5on.src="humanon2.jpg"; 
px5off= new Image(112,50);
px5off.src="humanoff.jpg";    

px6on= new Image(112,50); 
px6on.src="featureon2.jpg"; 
px6off= new Image(112,50);
px6off.src="featureoff.jpg";    

px7on= new Image(112,50); 
px7on.src="sourceson2.jpg"; 
px7off= new Image(112,50);
px7off.src="sourcesoff.jpg";    

function hvr(imgName)
{imgOn=eval(imgName + "on.src");
 document[imgName].src= imgOn;
}

function norm(imgName)
{imgOff=eval(imgName + "off.src");
 document[imgName].src= imgOff;
}