function show (number)
{
    var x = document.getElementById ("x" + number);
    var y = document.getElementById ("y" + number);

    x.style.display="block";
    y.style.display="none";
}

function hide (number)
{
    var x = document.getElementById ("x" + number);
    var y = document.getElementById ("y" + number);

    x.style.display="none";
    y.style.display="block";
}

// -->

<!--
function init () {
	preloadImages();
}

function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}

function changeImages() {
	if (document.images && (preloadFlag == true)) {
		for (var i=0; i<changeImages.arguments.length; i+=2) {
			document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
		}
	}
}

var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		m2_act = newImage("img/rec1-1.png");
		preloadFlag = true;
	}
}