var pre
var post

if (document.layers){
  //Netscape 4 specific code
  pre = 'document.';
  post = '';
}
if (document.getElementById){
  //Netscape 6 specific code
  pre = 'document.getElementById("';
  post = '").style';
}
if (document.all){
  //IE4+ specific code
  pre = 'document.all.';
  post = '.style';
}

function SelectThis(id) {
  eval(pre + id + post).backgroundColor='#c0c0c0';
  eval(pre + id + post).cursor='hand';
}