Finance Counter Plugin

We want a countdown timer that we can put into a wordpress site. The idea is that it will be currency, and will display a starting figure. Every second we want this figure to be updated by a certain amount each time, so that the figure was be getting higher and higher every second by the same amount. Something along the lines of these, but counting up instead of down.. [login to view URL] The display should be like.. £ 00 000 000 000 If you can code it so that we can put in the value to increase by each time that will be perfect. The deliverable should be in the form of a wordpress plugin that uses shortcode to insert in a widget or into a post or page.