SO fiddle

Test Fiddle mainly for SO Questions

by Nick Craver

HTML

<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.4/themes/overcast/jquery-ui.css">
<div id="map_canvas"></div>

CSS

#map_canvas { border: solid 2px #ddd; height: 300px; position: relative; }

JavaScript

$('#map_canvas').each(function() {
    var newLeft = $(this).width() * .302;
    $(this).animate({left: newLeft, width:'69.8%'},3000);
});