if (document.images) {
howitworksoff=new Image();
howitworksoff.src= "http://www.educatorstravel.com/images/howitworksoff.gif";
howitworkson=new Image();
howitworkson.src= "http://www.educatorstravel.com/images/howitworkson.gif";
membershipoff=new Image();
membershipoff.src= "http://www.educatorstravel.com/images/membershipoff.gif";
membershipon=new Image();
membershipon.src= "http://www.educatorstravel.com/images/membershipon.gif";
destinationoff=new Image();
destinationoff.src= "http://www.educatorstravel.com/images/destinationoff.gif";
destinationon=new Image();
destinationon.src= "http://www.educatorstravel.com/images/destinationon.gif";
contactoff=new Image();
contactoff.src= "http://www.educatorstravel.com/images/contactoff.gif";
contacton=new Image();
contacton.src= "http://www.educatorstravel.com/images/contacton.gif";
aboutoff=new Image();
aboutoff.src= "http://www.educatorstravel.com/images/aboutoff.gif";
abouton=new Image();
abouton.src= "http://www.educatorstravel.com/images/abouton.gif";
homeoff=new Image();
homeoff.src= "http://www.educatorstravel.com/images/homeoff.gif";
homeon=new Image();
homeon.src= "http://www.educatorstravel.com/images/homeon.gif";

}

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