Countdown Timer for sales page

Timer to count down time from the time a sales page is opened. The sales page is opened and in the body of the copy, a timer will start counting down a period of hours until the offer expires. The countdown timer should show hours, minutes, and seconds. **NOTE: Counter should not countdown to or from a DATE, but should countdown TIME FROM WHEN THE PAGE WAS FIRST OPENED. ** If the page is closed and the same person comes back, the timer should still be counting down the time from when they first opened the page. When time expires, the sales page is no longer available and they are directed to a different page. (I have scripts that will count down seconds and minutes, but I need one to count down hours.) ? This is NOT a "One Time Offer" - the person should be able to leave the page and return to find the timer still counting down the time from when they first opened the page. Should track with cookie and also have the option to track by IP address along with cookie. Needs different 'skins' or the ability to edit the layout and appearance of time (font size, color, border).? Needs to? be able to be added to body of a sales page in a specific position? or added to a pop-up window. ## Deliverables I've attached some scripts that could possibly be adapted. However, I think these scripts are "one time offer" so the person couldn't leave the page and come back or the offer would be expired. I want them to be able to leave the page and come back and have the timer still counting down the 48 hours (or 24 hours, or 12 hours, or whatever I'm using for the offer on that site).