Adding range to wp_link_pages()

I have some very long posts, some have more than 50 pages (<!--nextpage-->) and when using wp_link_pages, it give me 50 internal post links, clearly this isn’t usable.

How can I add a range to the wp_link_pages function?

The output should look like this: …4 – 5 – 6 – 7 – 8…

UPDATE 10/1/2012:

I’ve got the logic for adding the range but now I need to figure out how to add it to the existing wp_link_pages function?

Here is the example function:

function limitPagination(){
    $displayPages = 5;
    $firstPage = 1;
    $lastPage = $numpages > 5;

    while($numpages > $displayPages){
        if(($pageNow > $firstPage +2) && ($pageNow < $lastPage - 2)){
                echo (($pageNow - 2).($pageNow - 1).$pageNow.($pageNow + 1).($pageNow + 2));
        }
    }
}