dynamic html pages

I am fairly new to php and am having an issue with creating pages "on the fly" that is not loading an html page but creating them from under php. what I need to do is this: function createpage1(){ //make page here } return(); function createpage2(){ //make page here } return; //main loop createpage1(); //delay for 10 secs createpage2(); exit; what I need is for page 1 to show up then after the time out the window clear and have page 2 show up. I can get them to both show up at the same time in the same window but how do I make it look like it has loaded 2 pages. Jon