<input type="text" maxlength="25" value="" id="reg_login" name="reg_login" size="25">
<div id="login_availability"</div>

<script type="text/javascript">
  $(document).ready(function() {
		var min_chars = 3;
		var pass_chars = 6;
		var login_error = \'<span class="checknotok">The login must contain at least 3 characters.</span>\';
		var email_error =\'Your email seems to be incorrect or too short. You need a valid email.\';
		var pass_error =\'<span class="checknotok">The password has to be 6 characters long.</span>\'
		var pass_decent=\'<span class="checkok">Your password is long enough, but it could be trickier to guess!</span>\';
		var checking_html = \'Checking...\';


		$(\'#reg_login\').keyup(function(){
	           
			var current_login = $(this).attr(\'id\');
			if($(\'#reg_login\').val().length < min_chars){
				$(\'#login_availability\').html(login_error);
			}else{			
				check_availability(current_login);
			}
		});

		$(\'#reg_alias\').keyup(function(){
			var current_alias = $(this).attr(\'id\');
			if($(\'#reg_alias\').val().length < min_chars){
				$(\'#alias_availability\').html(login_error);
			}else{			
				check_availability(current_alias);
			}
		});

		$(\'#reg_email\').keyup(function(){
			var current_email = $(this).attr(\'id\');
			if($(\'#reg_email\').val().length < pass_chars){
				$(\'#email_availability\').html(email_error);
			}else{			
				check_availability(current_email);
			}
		});
		
		$(\'#reg_plaintext_passwd\').keyup(function(){
			if($(\'#reg_plaintext_passwd\').val().length < pass_chars){
				$(\'#passwd_availability\').html(pass_error);
			} else {
				$(\'#passwd_availability\').html(pass_decent);
			}
		});

  });

function check_availability(a){
			var field = $(\'#\'+ a).val();
			var a = a.replace("reg_","");
			var dat = a+"="+field;

	$.ajax({
		dataType: "json",
		url: "{FULL_ROOT}include/checkreg.php",
		data: dat,
		success: function(result){
				if(!result){
					$(\'#\'+a+\'_availability\').html(\'<span class="checkok">\'+ field + \' is available</span>\');
				}else{
					$(\'#\'+a+\'_availability\').html(\'<span class="checknotok">\'+ field + \' is not available</span>\');
				}
		}
	})
}  
</script>

<?php
// GET FUDforum globals
include '../GLOBALS.php';

// Connect to database.
$db = mysql_connect($DBHOST, $DBHOST_USER, $DBHOST_PASSWORD);
mysql_select_db($DBHOST_DBNAME, $db);

// Dig out the key used in our GET.
$regtype = array_keys($_GET);

// Use the first key as SQL field.
$reg = mysql_real_escape_string($regtype[0]);

// Convert the array value to lowercase.
$field = strtolower(mysql_real_escape_string($_GET[$reg]));

// Compare the lowercase login with lowercase from database.
$sql = "SELECT ".$reg." FROM ".$DBHOST_TBL_PREFIX."users WHERE lower(".$reg.") = '".$field."'";
$result = mysql_query($sql);

// Convert the result to an object for JSON.
$result = mysql_fetch_object($result);

// encode the object into JSON, will echo false on empty result
echo json_encode($result);
?>

.checkok {color: green;padding-right:20px;background:url({THEME_IMAGE_ROOT}/checkbuttons2.png) no-repeat right top;display:block;height:16px}
.checknotok {color: red;padding-right:20px;background:url({THEME_IMAGE_ROOT}/checkbuttons2.png) no-repeat right -16px;display:block;height:16px}
#login_availability{display:inline-block}
#alias_availability{display:inline-block}
#passwd_availability{display:inline-block}
#email_availability{display:inline-block}