function hide_instructions () {
	var instBox = document.getElementById('instructions');
	instBox.className=instBox.className.replace("show", "hide");	
}
function addListeners(e) {
	var instBox = document.getElementById('instructions');
	addEvent(instBox, 'click', hide_instructions, false);
}

addEvent(window, 'load', addListeners, false);

function addEvent(elm, evType, fn, useCapture) {
	if (elm.addEventListener) {
		elm.addEventListener(evType, fn, useCapture);
		return true;
	} else if (elm.attachEvent) {
		var r = elm.attachEvent('on'+evType, fn);
		return r;
	} else {
		elm['on'+evType] = fn;
	}
}