duda en poder traducir mi script

[xoceunder]

de como selecionar el idioma

tengo este codigo

Código PHP:

if( isset($_REQUEST["language"]) )
    {
        $_SESSION["current_language"] = $_REQUEST["language"];
        setcookie("default_language", $_REQUEST["language"], time() + 31536000);
        $G_current_language = $_REQUEST["language"];
}
 
    <form name="language" action="<?php echo( $_INCLUDER ); ?>" method="<?php echo( $_METHOD ); ?>">
    <select onChange="location.href='<?php echo( $_INCLUDER ); ?>?language=' + this.value;" name="language">
    <option selected="selected" value="en">English</option>
    <option value="es">Español</option>
    </select>
    </form><br />
 

pero me tira eror en esta linia

Warning: Cannot modify header information - headers already sent by (output started at C:\AppServ\www\cpanel\index.php:2) in C:\AppServ\www\cpanel\index.php on line 14

Codigo linia 14: setcookie("default_language", $_REQUEST["language"], time() + 31536000);