var interval, num;

function timer() {
	num = 1;
	autoTabs();
	interval = setInterval("autoTabs();", 9000 );
}

function autoTabs() {
	changeLayer(num,false);
	num++;
	if(num>3){num=1};

}


function changeLayer(tabNum,cleared) {
	for(i=1;i<4;i++) {
		document.getElementById("homeTab"+i).style.display = "none";
		document.getElementById("switch"+i).style.display = "block";
		document.getElementById("switchon"+i).style.display = "none";
		
	}
	document.getElementById("homeTab"+tabNum).style.display = "block";
	document.getElementById("switchon"+tabNum).style.display = "block";
	document.getElementById("switch"+tabNum).style.display = "none";
}