function showBanner1() {
	document.getElementById("banner1_over").style.display = 'block';
	document.getElementById("banner2_over").style.display = 'none';
	document.getElementById("banner3_over").style.display = 'none';
	document.getElementById("banner4_over").style.display = 'none';
}

function showBanner2() {
	document.getElementById("banner1_over").style.display = 'none';
	document.getElementById("banner2_over").style.display = 'block';
	document.getElementById("banner3_over").style.display = 'none';
	document.getElementById("banner4_over").style.display = 'none';
}

function showBanner3() {
	document.getElementById("banner1_over").style.display = 'none';
	document.getElementById("banner2_over").style.display = 'none';
	document.getElementById("banner3_over").style.display = 'block';
	document.getElementById("banner4_over").style.display = 'none';
}

function showBanner4() {
	document.getElementById("banner1_over").style.display = 'none';
	document.getElementById("banner2_over").style.display = 'none';
	document.getElementById("banner3_over").style.display = 'none';
	document.getElementById("banner4_over").style.display = 'block';
}