my sample code is

<html>
<head><title>Welcome to DARUL AMAN MADRASAH</title></head>
<body>
&lt;script language="javascript" type="text/javascript" >
function log()
{
document.getElementById("dvlogin").innerText="<?php login(); ?>";
}
</script>
<?php
function login()
{
$db = mysql_connect("localhost", "525011_akmwf","10+10=20");
$cno=$HTTP_POST_VARS['userid'];
mysql_select_db("akmwfpadma_99k_akmwfpadma",$db);
$result = mysql_query("SELECT * FROM user where userid='Belal' and upassword='10+10=20'",$db);
if ($myrow = mysql_fetch_array($result))
{
echo "Login ok!";
here html element "userid" textbox value = $myrow[1] and
html element "password" textbox value = $myrow[3]

get me syntax
how can it possible
pls reply me.

}
else {
echo "Login failed!"; }
}
?>
<div id="dvlogin"></div>
<input type="text" id="userid" name="userid" />
<input type="password" id="password" name="password" />
<img alt="" onclick="log()" border="0" src="btn-login.jpg"/>
</body>
</html>