function setDisplay(e, d){
	document.getElementById(e).style.display = d;
}
function setHTML(e, h){
	document.getElementById(e).innerHTML = h;
}
function ajaxPost(url, str, callBack, returnObj){
	new Ajax.Request(url, {
		method: 'post',
		parameters: str, 
		onSuccess: function(obj){
			callBack(obj.responseText, returnObj);
		}
	});
}