function initCal () {	
	var calBody = document.getElementById('calBody');
	var events = calBody.getElementsByTagName('div');
	for (var i = 0; i < events.length; i++) {
		var ev = events[i];
		if (ev.className == 'event-info') {
			continue;
		}
		ev.onmouseover = on;
		ev.onmouseout = off;		
	}
}

function on () {
	this.className += ' hover';
}

function off () {
	this.className = this.className.replace('hover', '');
}

window.onload = initCal;