[jQuery] simple animate dont working, why

[jQuery] simple animate dont working, why


Get example animate from site...
if i use http://code.jquery.com/jquery-latest.js - all right
if i use local copy of jquery-latest.js - nothing
if i use downloaded jquery-1.2.3.js - nothing
why? i dont understand...
<html>
<head>
<!--script src="/scripts/jquery-latest.js"></script-->
<!--script src="/scripts/jquery-1.2.3.js"></script-->
<script src="http://code.jquery.com/jquery-latest.js"></script>
<script>
$(document).ready(function(){
// Using multiple unit types within one animation.
$("#go").click(function(){
$("#block").animate({
width: "70%",
opacity: 0.4,
marginLeft: "0.6in",
fontSize: "3em",
borderWidth: "10px"
}, 1500 );
});
});
</script>
<style>
div {
background-color:#bca;
width:100px;
border:1px solid green;
}
</style>
</head>
<body>
<button id="go">ยป Run</button>
<div id="block">Hello!</div>
</body>
</html>