Eloquent coding

A simple function I wrote 2 years ago looked like this:

function booleanToggle(bool, id1, id2) { 
// getObject is a super-old-school function kinda like $
 var style1 = (typeof id1 == 'string') ? 
       getObject(id1, true) : id1.style;
 var style2 = (typeof id2 == 'string') ? 
       getObject(id2, true) : id2.style; 
 if (eval(bool)){   
  style1.display = '';   
  style2.display = 'none';
 } else {
   style1.display = 'none';
   style2.display = '';
 }
}

I ran across it today and couldn't bear looking at it, so now it looks like this:

function booleanToggle(bool, id1, id2) {
$(id1).style.display = eval(bool) ? '' : 'none';
if (id2) { $(id2).style.display = eval(bool) ? 'none' : ''; }
}

I wanted to keep the same signature for backwards compatibility.

There's something about the change that I can't describe. I'm happy because there's less code and I don't think I sacrificed readability. I even made it more flexible, making the last argument optional.

If my prose were eloquent, I'd be able to explain this idea to junior engineers. But it's not.