[jQuery] drag element w/o interface library

[jquertil]

Hello,

I'm trying to drag an element without the use of any plugin or
library. The code below works - except when I invoke the mousedown on
an image element.

In that case, the browser seems to think I want to drag the image off
the page.

Is there a way to override that? Again, code below works fine on
elements that aren't images.


isMouseDown = false;
$('#popup').mousedown(function(e){
        isMouseDown = true;
        $(document).mousemove(function(e){
                if(isMouseDown == true){
                        // ...moving it around
                }
        });
}).mouseup(function(e){
        isMouseDown = false;
});