if (document.images) {
homeoff=new Image();
homeoff.src= "images/side/homeoff.jpg";
homeon=new Image();
homeon.src= "images/side/homeon.jpg";
newsoff=new Image();
newsoff.src= "images/side/newsoff.jpg";
newson=new Image();
newson.src= "images/side/newson.jpg";
productsoff=new Image();
productsoff.src= "images/side/productsoff.jpg";
productson=new Image();
productson.src= "images/side/productson.jpg";
servicesoff=new Image();
servicesoff.src= "images/side/servicesoff.jpg";
serviceson=new Image();
serviceson.src= "images/side/serviceson.jpg";
patentsoff=new Image();
patentsoff.src= "images/side/patentsoff.jpg";
patentson=new Image();
patentson.src= "images/side/patentson.jpg";
papersoff=new Image();
papersoff.src= "images/side/papersoff.jpg";
paperson=new Image();
paperson.src= "images/side/paperson.jpg";

}

function imageOn (imagename){
  document[imagename].src=eval(imagename+"on.src");
 }
function imageOff (imagename){
  document[imagename].src=eval(imagename+"off.src");
 }