if (document.images) {
slideoff=new Image();
slideoff.src= "images/menus/slideoff.gif";
slideon=new Image();
slideon.src= "images/menus/slideon.gif";
amenitiesoff=new Image();
amenitiesoff.src= "images/menus/amenitiesoff.gif";
amenitieson=new Image();
amenitieson.src= "images/menus/amenitieson.gif";
contactoff=new Image();
contactoff.src= "images/menus/contactoff.gif";
contacton=new Image();
contacton.src= "images/menus/contacton.gif";
previousoff=new Image();
previousoff.src= "images/buttons/previousoff.gif";
previouson=new Image();
previouson.src= "images/buttons/previouson.gif";
nextoff=new Image();
nextoff.src= "images/buttons/nextoff.gif";
nexton=new Image();
nexton.src= "images/buttons/nexton.gif";
}

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