colors = new Array("pagemaster01","pagemaster02");
colorIndex = 0;
function changeColor() {
 	document.getElementById('pagemaster').className = colors[colorIndex];
 	document.body.className = colors[colorIndex];
 	colorIndex = (colorIndex + 1) % colors.length;
}

function startColorChange() {
 setInterval("changeColor()",10000);
}

startColorChange();