<div id="div1">test  </div> <script type="text/javascript"> 
var bj = "url(logo3.jpg) no-repeat"; 
div = window.document.getElementById("div1"); 
div.style.background=bj; 
document.getElementById("div1").style.width=300px
document.getElementById("div1").style.height=500px;    
</script>body>