// FUNCTION: check/change image class
function imageHome() {
	// check w3c standards compliance
	var w3c = document.getElementById ? true : false;

	if (w3c == true && secondsCountDown == 0) {
		var imageID   = document.getElementById('home-image');
		var captionID = document.getElementById('home-image-caption');
		if (imageID.className == 'home-image-1') {
			imageID.className   = 'home-image-2';
			captionID.className = 'home-image-caption-2';
		} else {
			imageID.className   = "home-image-1";
			captionID.className = 'home-image-caption-1';
		} 
	}
}