function over(i,k) {
 v=navigator.appVersion.substring(0,1);
 if (v='4') {
  document.all.tags('TD')['t' + i].style.backgroundImage = 'url(/images/b'+k+'.gif)';
 }
}

function out(i,k) {
 v=navigator.appVersion.substring(0,1);
 if (v='4') {
  document.all.tags('TD')['t' + i].style.backgroundImage = 'url(/images/a'+k+'.gif)';
 }
}