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if (ereg("^/products/([0-9]+)/$",$dn,$m)){
    $block_id = $m[1];
    $dn_page = "/products/";
}

if (ereg("^/products/([-a-z0-9_\.]+)/$",$dn,$m)){
    $block_alias = $m[1];
    $dn_page = "/products/";
}

if (ereg("^/articles/([0-9]+)/$",$dn,$m)){
    $block_id = $m[1];
    $dn_page = "/articles/";
}

if (ereg("^/news/([0-9]+)/$",$dn,$m)){
    $block_id = $m[1];
    $dn_page = "/news/";
}

if (ereg("^/products/([0-9]+)/([0-9]+)/$",$dn,$m)){
    $block_id = $m[1];
    $product_id = $m[2];
    $dn_page = "/products_detail/";
}

if (ereg("^/products/([-a-z0-9_\.]+)/([-a-z0-9_\.]+)/$",$dn,$m)){
    $block_alias = $m[1];
    $product_alias = $m[2];
    $dn_page = "/products_detail/";
}
// дальше начинается ад, не для слабонервных