var Ajax = new Object();

// =========================================
// url is the location of an XML file, callBackMethod is a JS function that will parse the returned XML
// =========================================
Ajax.Request = function(url, callbackMethod)
{
	Ajax.request = Ajax.createRequestObject();
	Ajax.request.onreadystatechange = callbackMethod;
	Ajax.request.open("POST", url, true);
	Ajax.request.send(url);
}

// =========================================
// creating the object to send the xml request, IE + FF compatibility
// =========================================
Ajax.createRequestObject = function()
{
	var obj;
	if(window.XMLHttpRequest)
	{
		obj = new XMLHttpRequest();
	}
	else if(window.ActiveXObject)
	{
		obj = new ActiveXObject("MSXML2.XMLHTTP");
	}
	return obj;
}

// =========================================
// Prevents the javascript from proceeding unless it receives a document
// =========================================
Ajax.CheckReadyState = function(obj)
{
	if(obj.readyState == 1)
	{
	// This chunk should be moved into page.js so the JS file can be a generic file used by an ajax program
		document.getElementById('ses').disabled=true;
		document.getElementById('sem').disabled=true;
		document.getElementById('pro').disabled=true;
		document.getElementById('sub').disabled=true;
		document.getElementById('num').disabled=true;
		document.getElementById('course').disabled=true;
	// This chunk should be moved into page.js so the JS file can be a generic file used by an ajax program
		document.getElementById('debug').innerHTML = "Please Wait...";
	}
	if(obj.readyState == 4)
	{
		if(obj.status == 200)
		{
		// This chunk should be moved into page.js so the JS file can be a generic file used by an ajax program
			document.getElementById("ses").disabled=false;
			document.getElementById("sem").disabled=false;
			document.getElementById("pro").disabled=false;
			document.getElementById("sub").disabled=false;
			document.getElementById("num").disabled=false;
			document.getElementById("course").disabled=false;
		// This chunk should be moved into page.js so the JS file can be a generic file used by an ajax program
			document.getElementById('debug').innerHTML = "";
			return true;
		}
		else
		{
			document.getElementById('debug').innerHTML = "HTTP " + obj.status;
		}
	}
}