Apple Style Flip Counter Project

We are trying to set an Apple like counter to show in a website(A) the amount of orders and the lifetime sales of other website (B). We can provide of a [login to view URL] on the root of the other side that calls those amounts, but I guess this will need to refresehd itself every 1min or so... An on site (A) we need the Javascript magic to adapt this counter to increment its number on each new order on the other site, BUT without the refreshing the page. We want that using a cron job on website (B) to run the php that calls the amount of orders and sales, and pass them to the other site (A) change the counter, without refreshing the page... Here is an examplo of what we want... [login to view URL] but we want that counter only changes when a new order on the other site is completed. Do I explain myself? Thanx to all! Tino