Submit goto URL?

Submit goto URL?

Hi all, i have JavaScript code:
  1. function jumpto()
  2. {
  3.     var page = prompt('Enter the page number you wish to go to:', '1');
  4.     var per_page = '3';
  5.     var base_url = './viewforum.php?f=2';
  6.     if (page !== null && !isNaN(page) && page == Math.floor(page) && page > 0)
  7.     {
  8.         if (base_url.indexOf('?') == -1)
  9.         {
  10.             document.location.href = base_url + '?start=' + ((page - 1) * per_page);
  11.         }
  12.         else
  13.         {
  14.             document.location.href = base_url.replace(/&/g, '&') + '&start=' + ((page - 1) * per_page);
  15.         }
  16.     }
  17. }
Now i want compatible this code with Jquery, but i can not do it.
Please help me, thanks you very much