script嵌套script

页面如下

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<head>

<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

<title>example</title>

<script type="text/javascript">

	document.write("<p>This is an inserted.</p>");

</script>

</head>



<body>

<script type="text/javascript" src="example.js"/>

	<script>

		insertParam("This is a test.")

	</script>

</script>	

</body>

</html>

脚本如下

function insertParam(text){

	var str= "<p>";

	str += text;

	str +="</p>";

	document.write(str);

}

页面中执行insertParam无输出，
在dw中页面script标签嵌套script报错。，

运行时，firebug一切正常，

望指点