A form will keep track of each pages visibility through use of the page's pageHidden property. You can set this property as desired using the following function of the same name:
function pageHidden(pageNum, hidden);
pageNum is an integer representing the page number of the page you which to hide.
hidden is a true of false value for pageHidden. If you wish to hide a page, this value should be true, and if you wish to show the page, this value should be false.