function changeto(highlightcolor){
   source=event.srcElement;
   if (source.tagName=="TR"||source.tagName=="TABLE"){return;}
   while(source.tagName!="TD"){
      source=source.parentElement;
   }
   if (source.style.backgroundColor!=highlightcolor&&source.id!="none"){
      source.style.backgroundColor=highlightcolor;
   }
}

function changeback(originalcolor){
    if (event.fromElement.contains(event.toElement)||source.contains(event.toElement)||source.id=="ignore"){
        return;
    }
    if (event.toElement!=source){
        source.style.backgroundColor=originalcolor;
    }
}