index.php

<?

include"config.php";
/*
CREATE TABLE  `user` (
 `u_id` INT NOT NULL AUTO_INCREMENT PRIMARY KEY ,
 `u_name` VARCHAR( 255 ) NOT NULL ,
 `u_pass` VARCHAR( 255 ) NOT NULL ,
 `u_email` VARCHAR( 255 ) NOT NULL ,
 `u_about` INT NOT NULL
) ENGINE = MYISAM ;

*/


$u_name = strip_tags($_POST['u_name']);
$u_pass = md5($_POST['u_pass']);
$u_email = strip_tags($_POST['u_email']);
$u_about = strip_tags($_POST['u_about']);

if(isset($_POST['insert'])){
    if(strlen($u_name)<3){
		echo"
		<script>alert('Name petit')</script>
		";
	}elseif(strlen($u_about)<5){
		echo"name petit";
    }else{
		$AddUser = mysql_query("INSERT INTO user
		(u_name,u_pass,u_email,u_about)
		VALUES
		('$u_name','$u_pass','$u_email','$u_about')
		")or die (mysql_error());
	}

    if(isset($AddUser)){
		echo"
		<h2 style='color:green;'>insert is donne</h2>
		";
	}
}


?>
<script type="text/javascript">
function valide(){
var name = document.getElementById('name').value;
    pass = document.getElementById('pass').value;
	email = document.getElementById('email').value;
	about = document.getElementById('about').value;

	if(name!="" && pass!="" && email!="" && about!=""){
		if(isNaN(name)){

			if(email !=""){

			  if(pass != ""){

			  }else{

			  }
			}else{
				alert('hhhhh xd');
				return false;
			}
		}else{
			alert('name is Not Number :( ');
			return false;
		}
	}else{
		alert('All Form invalide');
		return false;
	}
}
</script>
<form action="index.php" method="POST" onsubmit="return valide()">
  name : <input id="name" name="u_name" id="name" type="text"/><br/>
  password : <input id="pass"  name="u_pass" id="pass" type="password"/><br/>
  email : <input id="email"  name="u_email" id="email" type="email"/><br/>
  about : <input id="about" name="u_about" id="about" type="text"/><br/>
  <input name="insert"  type="submit"/><br/>
</form>