// preloading the images

function preloadImages() {

	PPics = new Array(3);
	for (i = 0; i < 3; i++) {
		PPics[i] = new Image();
	}

	PPics[0].src = "images/sta_pool1.jpg";
	PPics[1].src = "images/sta_pool2.jpg";
	PPics[2].src = "images/sta_pool3.jpg";
}

// function that replaces image
function replace(ImgToChange, ImgToShow){
ImgToChange.src=PPics[ImgToShow].src
}