function showDescription(div_id, closeButton){
		if(document.getElementById(div_id).className=='coursedescriptionShow'){
			document.getElementById(div_id).className='coursedescriptionHide';
			document.getElementById(closeButton).style.display='none';
		}else{
			document.getElementById(div_id).className='coursedescriptionShow';
			document.getElementById(closeButton).style.display='inline';
		}
}
function showAllDescriptions(course_total){
		for (i = 1; i <= course_total; i++) {
			document.getElementById('course' + i).className='coursedescriptionShow';
			document.getElementById('courseclose' + i).style.display='inline';
		}
}
function hideAllDescriptions(course_total){
		for (i = 1; i <= course_total; i++) {
			document.getElementById('course' + i).className='coursedescriptionHide';
			document.getElementById('courseclose' + i).style.display='none';
		}
}