if (document.images) {
testdriveoff=new Image();
testdriveoff.src= "images/home/testdriveoff.gif";
testdriveon=new Image();
testdriveon.src= "images/home/testdriveon.gif";
buynowoff=new Image();
buynowoff.src= "images/home/buynowoff.gif";
buynowon=new Image();
buynowon.src= "images/home/buynowon.gif";
subscribeoff=new Image();
subscribeoff.src= "images/home/subscribeoff.gif";
subscribeon=new Image();
subscribeon.src= "images/home/subscribeon.gif";
}


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