function DivChange(){
	var box1 = document.getElementById("change_box1").style.display
	
	if (box1 == "none"){
		document.getElementById("change_box1").style.display = "block";
		document.getElementById("change_box2").style.display = "none";
	}
	
	else{
		document.getElementById("change_box1").style.display = "none";
		document.getElementById("change_box2").style.display = "block";
	}
}

function DivChangeOnTime(){
	window.setInterval("DivChange()", 10000);
}
		
window.onLoad = DivChangeOnTime();