Not sure what you mean... both browsers seemed to render the DIV just fine. Here's what I used to test:
<html>
<head>
<style type="text/css">
#bar {
background: url(http://mcilveen.100webspace.net/images/bars_green.gif) repeat-x;
width: 150px;
}
</style>
</head>
<body>
Test:
<div id="bar"> </div>
</body>
</html>