var load_flag = 0;
var index = 0;
var photos = ["20100227_TidePoint-341_Cylindrical_69.jpg","SeattleKerryPark.jpg","InnerHarborReflection.jpg"];
	
function initialize() {
	if(load_flag == 0){
		index = Math.floor(Math.random()*3);
		load_flag=1;
	}
	document.main_img.src = photos[index];
	index = (index +1) % 3;
	setTimeout("initialize()",20000);
}