Languages url path

I need to acces my languages in my site from direct url like mysite.com/index.php?language=en and i don't know how to do it or if is possible on the script that i have..
here is the code how languages works

function setlang( $spr )
{
    @session_start;
    $url = parse_url( WEB_PATH );
    if ( substr( $url['host'], 0, 3 ) == "www" )
    {
        $domain = substr_replace( $url['host'], null, 0, 3 );
    }
    else
    {
        $domain = $url['host'];
    }
    @setcookie( "langcookie", @$spr, @time( ) + @COOKIE_EXPIRE, @COOKIE_PATH, @$domain );
    if ( isset( $_POST['lang_ref'] ) && !preg_match( "/http:\\/\\//", $_POST['lang_ref'] ) )
    {
        $referer = $_POST['lang_ref'];
    }
    else if ( preg_match( "~".str_replace( "www", "", WEB_PATH )."~is", str_replace( "www", "", $_SERVER['HTTP_REFERER'] ) ) )
    {
        if ( preg_match( "/\\?lang=(.*)/", $_SERVER['HTTP_REFERER'] ) )
        {
            $referer = preg_replace( "/\\?lang=(.*)/", "", $_SERVER['HTTP_REFERER'] );
        }
        else
        {
            $referer = $_SERVER['HTTP_REFERER'];
        }
        $referer = $referer ? $referer."?lang=".$spr : NULL;
    }
    if ( !empty( 'referer' ) )
    {
        @header( @"Location: {$referer}" );
    }
}


function loadlangs( )
{
    global $lang;
    global $default_lang;
    $query = @mysql_query( "SELECT * FROM languages" );
    echo "<table align=\"center\">".( "\n" )."<tr>";
    while ( $row = mysql_fetch_assoc( $query ) )
    {
        $short = $row['lang_shortcut'];
        $name = $row['lang_name'];
        $img = $row['lang_image'];
        $img_off = $row['lang_image_off'];
        if ( $short == $_COOKIE['langcookie'] || $short == $default_lang && empty( $_COOKIE['langcookie'] ) )
        {
            echo "<td>\n\t\t\t<img src=\"".WEB_PATH.$img_off."\" alt=\"".$lang['2']." ".$name."\" title=\"".$lang['2']." ".$name."\" />\n\t\t\t</td>".PHP_EOL;
        }
        else
        {
            echo "<td>\n\t\t\t<form method=\"post\">\n\t\t\t<input type=\"image\" src=\"".WEB_PATH.$img."\" alt=\"".$lang['3']." ".$name."\" title=\"".$lang['3']." ".$name."\" name=\"lang\" value=\"".$short."\" style=\"padding:0; margin:0\" />\n\t\t\t<input type=\"hidden\" name=\"lang\" value=\"".$short."\" />\n\t\t\t<input type=\"hidden\" name=\"lang_ref\" value=\"".$_SERVER['REQUEST_URI']."\" />\n\t\t\t</form>\n\t\t\t</td>".PHP_EOL;
        }
    }
    echo "</tr></table>";
}

Code (markup):

if someone can look on this and tell me if is there any way to access directly the languages from url will be nice

 

I think a more in depth look at the script would be needed to answer the question.