node map display produces invalid javascript when a node title contains a single quote

I ran across a problem on my site where the title of a location aware node contained a single quote, as in:

"This is gmap's best feature"

The single quote was mistaken as a string terminator, and the JavaScript addOverlay calls on nodes with single quotes in the title failed to parse. No google map was displayed, and my page was far less interesting.

A check_plain() did the trick, nicely formatting up special characters into HTML entities. Adding it took care of my little quote problem. Here is the patch against the current cvs version:

142c142
<       $newmarker['tooltip']=check_plain($n->title);
---
>       $newmarker['tooltip']=$n->title;