function makePOSTRequest(url, parameters, updateAction, rscFunc) {
	var http_request = false;
	var useReadyState=true;
	if (window.XMLHttpRequest) { // Mozilla, Safari,...
		 http_request = new XMLHttpRequest();
		 if (http_request.overrideMimeType) {
				http_request.overrideMimeType('text/html');
		 }
	} else if (window.ActiveXObject) { // IE
		 try {
				http_request = new ActiveXObject("Msxml2.XMLHTTP");
		 } catch (e) {
				try {
					 http_request = new ActiveXObject("Microsoft.XMLHTTP");
				} catch (e) {}
		 }
	}
	if (!http_request) {
		 alert('Cannot create XMLHTTP instance');
		 return false;
	}
	if(useReadyState){
		http_request.onreadystatechange = function() {
				rscFunc(updateAction, http_request);
		};
	}
	http_request.open('POST', url, useReadyState);
	http_request.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
	http_request.setRequestHeader("Content-length", parameters.length);
	http_request.setRequestHeader("Connection", "close");
	http_request.send(parameters);
	if(!useReadyState)
		rscFunc(updateAction);
}

function alertContents(takeAction, http_request) {
	if (http_request.readyState == 4) {
		if (http_request.status == 200) {
			switch(takeAction) {
			case "displaySchedule":
			case "gDisplaySchedule":
				document.getElementById("byMovieRoot").innerHTML=http_request.responseText;
				break;
		 }
		} else {
			alert('There was a problem with the request. '+http_request.status);
		}
	}
}

function displaySchedule(theaterid, disdate){
	toDo="displaySchedule";
	posstr="toDo=" + toDo;
	posstr+="&theaterid=" + theaterid;
	posstr+="&date=" + disdate;
	makePOSTRequest("assets/php/displayschedule.php",posstr,toDo, alertContents);
}

function gDisplaySchedule(groupkey, disdate){
	toDo="gDisplaySchedule";
	posstr="toDo=" + toDo;
	posstr+="&groupkey=" + groupkey;
	posstr+="&date=" + disdate;
	makePOSTRequest("assets/php/displayschedule.php",posstr,toDo, alertContents);
}