Untitled

<?php

include ('mysql.php');
include("temp.html");
if (isset ($_POST['agreeregister'])) {
        $username = mysql_escape_string($_POST['username']);
        $password = mysql_escape_string(sha1($_POST['password']));
        $random_num = ($_POST['random_num']);
        $length = 6;
        $query="SELECT * FROM users WHERE username ='$_POST[username]'";
        $result=mysql_query($query);
        $dup=mysql_num_rows($result);
    if ((!empty ($username) && !empty ($password)) && ($random_num > 0 && strlen($random_num) == ($length)) && ($dup == 0)) {

        $sql = mysql_query ("INSERT INTO users (
                    user_id,username,user_password,user_regdate)
                    VALUES (
                    '0','".$username."','".$password."','".time()."')
                    ");
                echo '<font face="arial" size="5"><br /><br /><center><table width="400" align="center" bgcolor="#00ff00"><tr><td><center><b>you are now registered!<br /><Please Log Into Your Account Above</b></center></tr></td></table></center><br /></font>';
    } else {
        echo '<font face="arial" size="5"><br /><br /><center><table width="400" bgcolor="#ff0000"><tr><td><center>Your Username / Password has to be longer than 6 characters<br />AND<br />You have to put in the correct Validation code</center></td></tr></table></center></font><meta http-equiv="refresh" content="5; url="register.php">';
}} else  if (isset($_POST['register1'])) {  {
        echo '<html>
<head>
<br /><center>-PLEASE READ-<br />
</head>
</font>
<font face="arial" size="3">
Before you sgin up i would like to say a few things...<br /><br />
1. You will not tell anyone you password, Even if they are your best friends<br />
2. You will not try to hack into the database and steal information<br />
3. You will not make any crude or racist usernames<br />
4. You will not upload inapproprate content in the photos/videos section<br /><br />
<center>Failure to follow any of the above WILL result in immediate account termination</center>
<br />
If you would like to complete account making, click  the "I Agree" button
</font>
</html><br />Please enter that desiered username and password<br />
    <right><form action="home.php" method="post">
        Username: <input type="text" name="username" /><br />
        Password: <input type="password" name="password" /><br />
        </right>';
srand(time());
$random = (rand()%6)+1;
$random1 = (rand()%6)+1;
$random2 = (rand()%6)+1;
$random3 = (rand()%6)+1;
$random4 = (rand()%6)+1;
$random5 = (rand()%6)+1;
$random_numbers = "$random$random1$random2$random3$random4$random5";
echo 'Validation code:'; echo ' <input type="text" name="random_num" />'; print(" ($random_numbers)");
echo '<br /><input type="submit" name="agreeregister" value="I Agree & Register" />
        </form>';
} } else {
echo '<center><form action="home.php" method="post"><input type="submit" name="register1" value="Click Here To Register" /></fotm>';}
?>