// show users currently in the laboratory

function htmlInsert( id, htmlData ) {
	document.getElementById(id).innerHTML = htmlData;	
}

// get httpRequest object
function getRequestObject() {
	if (window.XMLHttpRequest) { 
		return(new XMLHttpRequest()); 
	} else if (window.ActiveXObject) { 
		return(new ActiveXObject("Microsoft.XMLHTTP")); 
	} else {
		return (null);
	}
}

// action 
function showCurrentUsersInLab( inputfield, resultRegion ) {
	var baseAddress = "address of the php file";
	var data = "value name pair to be sent to the server";
	var address = baseAddress + "?" + data;	
	// proceed to the request 
	ajaxResult( address, resultRegion );
}

// ajax result
function ajaxResult( address, resultRegion ) {
	var request = getRequestObject();
	request.onreadystatechange = function() { showResponseText( request, resultRegion ); };
	request.open("GET", address, true);
	request.send(null);
}

function showResponseText( request, resultRegion ) {
	if( (request.readyState == 4) && (request.status == 200) ) {
		htmlInsert( resultRegion, request.responseText );	
	}	
}

function message() {
	alert('University Of Utah Nanofab Research Group');	
}