function showdiv() {
	document.getElementById('static').style.visibility = 'hidden'; 
	document.getElementById('first').style.visibility = 'visible'; 
}
function hidediv() {
	document.getElementById('first').style.visibility = 'hidden';
	document.getElementById('static').style.visibility = 'visible'; 	
}

function showdiv2() {
	document.getElementById('static').style.visibility = 'hidden';
	document.getElementById('second').style.visibility = 'visible'; 
}
function hidediv2() {
	document.getElementById('second').style.visibility = 'hidden'; 
	document.getElementById('static').style.visibility = 'visible'; 	
}

function showdiv3() {
	document.getElementById('static').style.visibility = 'hidden';
	document.getElementById('third').style.visibility = 'visible'; 
}
function hidediv3() {
	document.getElementById('third').style.visibility = 'hidden';
	document.getElementById('static').style.visibility = 'visible'; 		
}

function showdiv4() {
	document.getElementById('static').style.visibility = 'hidden';
	document.getElementById('fourth').style.visibility = 'visible'; 
}
function hidediv4() {
	document.getElementById('fourth').style.visibility = 'hidden'; 
	document.getElementById('static').style.visibility = 'visible'; 	
}