Include Jquery file
<script src="jquery.min.js"></script>

Include Connector Plugin file
<script src="jquery.connector_html5.js"></script>

Onload Script
<script>
	$( function() {
		$('#container').connector({
			connectFrom: '#box1', 
			connectTo: '#box2'
		});
	});
</script>

Where
connectFrom = ID or Class of Box FROM which you need to connect the path
connectTo = ID or Class of Box TO which you need to connect the path
'#container' = All paths will be drawn inside this element

Optional parameters
connectColor: '#ccc'  (sets color of the connecting curve path)
connectSize: 5  (sets the thickness of the path)

Using <canvas> tag and Bezier Curve function, we get these smooth curves in case of HTML5 version of Connector.