Jimmi,
<!DOCTYPE html>
<html>
<head>
<!--
<script src='http://code.jquery.com/jquery-latest.js'></script>
<link rel='stylesheet type=text/css href=tmp.css' />
-->
<style type='text/css'>
* {
margin: 0;
padding: 0;
}
.box_progress {
width: 750px;
height: 150px;
border: 1px solid;
margin: 10px;
position: relative;
}
.progress {
height: 100%;
position: absolute;
top: 0px;
background-image: -webkit-gradient(linear, left, right, color-stop(0, #00060A), color-stop(1, #99CCFF));
background-image: -ms-linear-gradient(left, #00060A, #99CCFF);
background-image: -o-linear-gradient(left, #00060A, #99CCFF);
background-image: -moz-linear-gradient(left, #00060A, #99CCFF);
background-image: -webkit-linear-gradient(left, #00060A, #99CCFF);
background-image: linear-gradient(to right, #00060A, #99CCFF)
}
.zvezdochki {
height: 100%;
width: 100%;
background:url(http://logotipka.ru/images/stories/skachat_img/stars/star21.png);
position: absolute;
top: 0px;
}
</style>
<script type='text/javascript'>
</script>
</head>
<body>
<div id='item0' class='box_progress'>
<div class='progress'></div>
<div class="zvezdochki"></div>
</div>
<script type='text/javascript'>
var o=document.querySelector('#item0>.progress');
o.style.width='30%';
</script>
</body>
</html>