function switchoption(op) {
	switch(op) {
		case "courses":
			document.getElementById("trainselect").style.display = 'none';
			document.getElementById("traincourses").style.display = 'block';
			document.getElementById("trainschedule").style.display = 'none';
			document.getElementById("trainregister").style.display = 'none';
			document.getElementById("optcourse").className = "chosenoption";
			document.getElementById("optschedule").className = " ";
			/*document.getElementById("optregister").className = " ";*/
			break;
		case "schedule":
			document.getElementById("trainselect").style.display = 'none';
			document.getElementById("traincourses").style.display = 'none';
			document.getElementById("trainschedule").style.display = 'block';
			document.getElementById("trainregister").style.display = 'none';
			document.getElementById("optcourse").className = " ";
			document.getElementById("optschedule").className = "chosenoption";
			/*document.getElementById("optregister").className = " ";*/
			break;
		case "register":
			document.getElementById("trainselect").style.display = 'block';
			document.getElementById("traincourses").style.display = 'none';
			document.getElementById("trainschedule").style.display = 'none';
			document.getElementById("trainregister").style.display = 'none';
			document.getElementById("optcourse").className = " ";
			document.getElementById("optschedule").className = " ";
			/*document.getElementById("optregister").className = "chosenoption";*/
			break;
		default:
			document.getElementById("trainselect").style.display = 'block';
			document.getElementById("traincourses").style.display = 'none';
			document.getElementById("trainschedule").style.display = 'none';
			document.getElementById("trainregister").style.display = 'none';
	}
}