function setUnderline(id, bool, color){
   if(bool){
      document.getElementById(id).style.textDecoration="underline";
   }else{
      document.getElementById(id).style.textDecoration="none";
   }
   document.getElementById(id).style.color=color;
}
function setBackground(id, color){
   document.getElementById(id).style.backgroundColor=color;
}