Making a Google Maps demo work with Chrome and Safari

This is a demo of dragging on Google Maps v3,

It doesn't work well in Google-Chrome or Safari --

what do I need to change to开发者_开发百科 make it work?

---

it is ok now:

.bind('mouseenter',function(){
                map.setOptions({
                    draggable:false
                })
            })
            .bind('mouseleave',function(){
                map.setOptions({
                    draggable:true
                })
            })