var xhr = false;
var dgbcnt = 0;

// preload loading image
loading1 = new Image();
loading1.src = "http://www.pwmwa.com/test/gfx/loading1.gif";

function dbg(message){
	dgbcnt ++;
	//document.getElementById('debug').innerHTML += dgbcnt+': '+message+'<br>\n';
}

function XHRInit() {
	dbg('XHRInit called...');
	if(xhr){
		return true;
	} else {
		req = false;
		// xhr object not ActiveX (IE 7 will use object not ActiveX, could both)
		if(window.XMLHttpRequest) {
			dbg('XHR native support detected...');
			try {
				xhr = new XMLHttpRequest();
				dbg('XHR object created');
			} catch(e) {
				xhr = false;
				dbg('ERROR creating XHR object');
		}
		// IE ActiveX version
		} else if(window.ActiveXObject) {
			dbg('XHR ActiveXObject support detected...');
			try {
				xhr = new ActiveXObject('Msxml2.XMLHTTP');
				dbg('XHR using Msxml2.XMLHTTP');
			} catch(e) {
				try {
					xhr = new ActiveXObject('Microsoft.XMLHTTP');
					dbg('XHR using Microsoft.XMLHTTP');
				} catch(e) {
					xhr = false;
					dbg('ERROR creating XHR object');
				}
			}
		} else {
			dbg('ERROR no XHR support at all detected');
			xhr = false;
			return false;
		}
		return true;
	}
}
function SubmitComment(url, event_id, returnvalue){
	// fill details div
	return XHRrequest(url, 'commentform_'+event_id, false, returnvalue);
}
function CloseDetails(responsediv_id){
	// hide details div
	document.getElementById('eventdetailexpand_'+responsediv_id).style.display = 'none';
	
	// show summary div
	document.getElementById('eventdetails_'+responsediv_id).style.display = 'block';
	
	return false;
}
function ShowDetails(url, responsediv_id, addcontent, returnvalue){
	// hide summary div
	document.getElementById('eventdetails_'+responsediv_id).style.display = 'none';
	
	// show details div
	document.getElementById('eventdetailexpand_'+responsediv_id).style.display = 'block';
	
	// put loading message into div
	document.getElementById('eventdetailexpand_'+responsediv_id).innerHTML = '<img class="loadingimage" src="http://www.pwmwa.com/test/gfx/loading1.gif" alt="loading..." /> loading details...<br />';
	
	// fill details div
	return XHRrequest(url, 'eventdetailexpand_'+responsediv_id, addcontent, returnvalue);
}
function XHRrequest(url, responsediv, addcontent, returnvalue){
	dbg('starting XHRrequest...');
	// is the xhr object there?
	if(XHRInit()){
		dbg('XHR initialized successfully');
		// let's make POST requests
		xhr.open('POST', url, true);
		dbg('xhr.open done');
		
		// the web service requires the request to be a real XML document
		//xhr.setRequestHeader('Content-Type', 'text/xml; charset=utf-8');
		xhr.setRequestHeader('Content-Type', 'text/html; charset=utf-8');
		dbg('xhr.setRequestHeader(1) done');
		
		// send SOAPAction header to invoke the webservice
		//xhr.setRequestHeader('SOAPAction', 'http://webservice_url');
		//dbg('xhr.setRequestHeader(2) done');
		
		// define the callback, called when state of xhr object changes
		xhr.onreadystatechange = function(){
			if (xhr.readyState == 4){
				ProcessXHR(xhr, responsediv, addcontent);
			}
		}
		dbg('xhr callback set');
		
		// finally send the HTTP request
		xhr.send('');
	}
	return returnvalue;
}

function ProcessXHR(xmlHttpReq, responsediv, addcontent){
	dbg('ProcessXHR() called');
	var responseText = '';
	
	// Fetch the values from our response XML
	/*
	var responseTag = xmlHttpReq.responseXML.getElementsByTagName('ResponseText');
	dbg('length of response tag: '+responseTag.length);
	
	// get tag content
	if(responseTag.length){
		responseText = responseTag[0].firstChild.data;
		dbg('response tag value = '+responseText);
	} else {
		responseText = 'no content';
	}
	*/
	// pure HTML version
	var responseText = xmlHttpReq.responseText;
	
	// fill div "result" with the response value
	if(addcontent){
    	document.getElementById(responsediv).innerHTML += responseText;
	} else {
		document.getElementById(responsediv).innerHTML = responseText;
	}
}

function OverlayOpen(title, url, message){
	if(message != ''){
		document.getElementById('overlaytitle').innerHTML = title;
	} else {
		document.getElementById('overlaytitle').innerHTML = 'System Message';
	}
	if(url != ''){
		document.getElementById('overlaycontent').innerHTML = '<br />loading...<br /><img class="loadingimage" src="http://www.pwmwa.com/test/gfx/loading1.gif" alt="loading..." /><br />';
		XHRrequest(url, 'overlaycontent', false);
	} else {
		document.getElementById('overlaycontent').innerHTML = message;
	}
	document.getElementById('overlaybutton').innerHTML = '<a id="overlayclosebutton" href="/xml06/js/basic.php?error=no_overlay_close" onclick="OverlayClose(); return false;">close message</a>';
	document.getElementById('overlay').style.display = 'block';
	document.getElementById('overlaybutton').focus();
	document.getElementById('footlink').style.display = 'none';
}
function OverlayClose(footlinkcontent){
	document.getElementById('overlay').style.display = 'none';
	document.getElementById('footlink').style.display = 'block';
}