function fcc() {
	var sever = document.getElementById("top_sever");
	sever.style.display = "block";
	}
function ftt() {
	var sever = document.getElementById("top_sever");
	sever.style.display = "none";
	}
function faa() {
	var sever = document.getElementById("top_course");
	sever.style.display = "block";
	}
function fss() {
	var sever = document.getElementById("top_course");
	sever.style.display = "none";
	}