Highlight table row using Javascript

if(document.getElementById(id).hasChildNodes()){
var ctds = document.getElementById(id).getElementsByTagName('TD');
for(var chld = 0; chld < ctds.length ;chld++ ){
ctds[chld].className ='selectedFromList';
}
}
if(document.getElementById(id).parentNode){
var ctrs = document.getElementById(id).parentNode.getElementsByTagName('TR');
for(var chld = 0; chld < ctrs.length ;chld++ ){
if(ctrs[chld].id != id){
var ctds = ctrs[chld].getElementsByTagName('TD');
for(var chltr = 0; chltr < ctds.length ;chltr++ )
ctds[chltr].className = 'noteSelectedNorm';
}
}
}