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How To Execute Javascript in .jsp Page

You can execute javascript by writing it internally in .jsp page, code is as follow....
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>JSP Page</title>
<script> // Starting tag of java script should be declared in head portion of .jsp page..
function fun()
{
if(document.f1.t1.value=="")
{
alert("PLEASE ENTER NAME");
}
else if(document.f1.t2.value=="")
{
alert("PLZ FILL PASSWORD FIELD ");
}
else
{
alert("yuppy Suusesfully done ");
}
}
</script>
</head>
<body>
<form name="f1" method="get" action="" onSubmit="return fun()"> // onSubmit attribute of form is compulsorily writtern .....with value (return keyword & name of function )
<table border="1" bgcolor="silver" ALIGN="CENTER">
<tr>
<td>NAME:</td>
<td><input type="text" name="t1"/></td>
</tr>
<tr>
<td>PASSWORD:</td>
<td><input type="password" name="t2"/></td>
</tr>
<tr>
<td align="center"><input type="submit" name="btnsub" value="Submt"/></td>
<td><input type="reset" value="Reset">
</tr>
</table>
</form>
</body>

</html>

Note: for executing the .jsp code you must have to set the server .....and default browser in netbeans 7.1.2 IDE thnx ......