<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.0/jquery.min.js"></script>
<script src="js/jquery.knob-1.0.1.js"></script>
<script>
$(function() {
$(".knob").knob({
max: 940,
min: 500,
thickness: .3,
fgColor: '#2B99E6',
bgColor: '#303030',
'release':function(e){
$('#img').animate({width:e});
}
});
$(".knob2").knob({
'release':function(e){
$('#img').animate({width:e});
}
});
});
</script>