var theme1 = document.getElementById("theme-1");
var theme2 = document.getElementById("theme-2");
theme1.style.display = "block";
theme2.style.display = "none";
setInterval("switch_theme()", 8000);

function switch_theme()
{
	theme1.style.display = theme1.style.display == "block" ? "none" : "block";
	theme2.style.display = theme2.style.display == "block" ? "none" : "block";
}