Stopping and starting a Timer in ASP.NET Ajax

If you have an ASP.NET UpdatePanel and and ASP.NET Timer that trigers theUpdatePanel to refresh, is it posible, in javascript, to stop/pause the timer?

I want to stop the timer when the users mouse is over the updatepanel!

From stackoverflow

• http://forums.asp.net/t/1094798.aspx

  then just attach a client side event to the updatepanel ala -

  http://encosia.com/2007/07/13/easily-refresh-an-updatepanel-using-javascript/ - but change to onmouseover to call them.