function change_r() {
	window.document.getElementsByTagName("link")[4].href = "../css/color-r.css";
	window.document.getElementsByTagName("link")[3].href = "../css/color-r.css";
	window.document.getElementsByTagName("link")[2].href = "../css/color-r.css";
}
function change_g() {
	window.document.getElementsByTagName("link")[4].href = "../css/color-g.css";
	window.document.getElementsByTagName("link")[3].href = "../css/color-g.css";
	window.document.getElementsByTagName("link")[2].href = "../css/color-g.css";
}
function change_b() {
	window.document.getElementsByTagName("link")[4].href = "../css/color-b.css";
	window.document.getElementsByTagName("link")[3].href = "../css/color-b.css";
	window.document.getElementsByTagName("link")[2].href = "../css/color-b.css";
}