var wait = true;

function course() {

		if(document.getElementById("course").style.display == "none" || document.getElementById("course").style.display == "") {
			document.getElementById("course").style.display = "block";

			document.getElementById("biochem").style.display = "none";
	
		} 

		else {
			document.getElementById("course").style.display = "none";}
	}

function biochem() {

		if(document.getElementById("biochem").style.display == "none" || document.getElementById("biochem").style.display == "") {
			document.getElementById("biochem").style.display = "block";

			document.getElementById("course").style.display = "none";

		} 
		
		else {
			document.getElementById("biochem").style.display = "none";}
	}