<head>
<title></title>
<script type="text/javascript" type="text/javascript" src="script.js"></script>
<link rel="stylesheet" type="text/css" href="style.css"/>
<meta name="" content="">
</head>
<body>
<div class="aaa" onclick="changeDiv()">AAAAA aaaaa</div>
</body>
function changeDiv()
{
document.write('<div id="bbb">BBBB nnnnBB</div>');
}
.aaa
{
color:#ff0000;
}
#bbb
{
color:blue;
}