var preloadedImg_1 = new Image();
  preloadedImg_1.src='images/icon_album.gif';
var preloadedImg_2 = new Image();
  preloadedImg_2.src='/images/tm02on.gif';
var preloadedImg_3 = new Image();
  preloadedImg_3.src='/images/tm03on.gif';
var preloadedImg_4 = new Image();
  preloadedImg_4.src='/images/tm04on.gif';
var preloadedImg_5 = new Image();
  preloadedImg_5.src='/images/tm05on.gif';
var preloadedImg_6 = new Image();
  preloadedImg_6.src='/images/tm06on.gif';
var preloadedImg_7 = new Image();
  preloadedImg_7.src='/images/tm07on.gif';

function changeImage(imageName,n) {
  eval("document."+imageName+".src=preloadedImg_"+n+".src");
}
function changeImageBack(imageName,n) {
  eval("document."+imageName+".src='images/"+imageName+"off.gif'");
}