RewriteRule ^([a-z]_\.)/([0-9])+$ index.php?op=$1&id=$2

RewriteEngine On 
RewriteCond %{REQUEST_URI} !(admin)
RewriteRule ^([a-zA-Z0-9]+)$ index.php?op=$1 [QSA,L]

RewriteRule ^(.*)$ index.php?route=$1 [L,QSA]

function mod_rewrite($url){
        global $mod_rewrite;
        if ($mod_rewrite){
            if (preg_match('#^[a-zA-Z\.]+\?[a-zA-Z]+\=[a-zA-Z]+$#i',$url)){

            $url=substr($url,1);
            $url=substr($url,strpos($url,'?')+1);
            $variable_val = substr($url,strpos($url,'=')+1);
            return $variable_val;

        } else {
            return $url;
        }
        }
}

function href()
{
    $args = func_get_args();
    $href = '';
    
    if ($args[0] == 'host')
        return HOST;
    
    foreach($args as $var)
    {
        $param = explode('=', $var);
        $href .= '/'. $param[1];
    }
        
    return HOST . ltrim($href, '/');
}