function phpWGOpenWindow(theURL,winName,features)
{
img = new Image();
img.src = theURL;
if (img.complete)
{
var width=img.width+40, height=img.height+40;
}
else
{
var width=640, height=480;
img.onload = function () { newWin.resizeTo( img.width+50, img.height+100); };
}
newWin = window.open(theURL,winName,features+',left=2,top=1,width=' + width + ',height=' + height);
}

function popuphelp(url)
{
window.open( url, 'dc_popup',
'alwaysRaised=yes,dependent=yes,toolbar=no,height=420,width=500,menubar=no,resizable=yes,scrollbars=yes,status=no'
);
}

function pwgBind(object, method) {
var args = Array.prototype.slice.call(arguments,2);
return function() {
return method.apply(object, args.concat(Array.prototype.slice.call(arguments,0)) );
}
}

function PwgWS(urlRoot)
{
this.urlRoot = urlRoot;
this.options = {
method: "GET",
async: true,
onFailure: null,
onSuccess: null
};
};

PwgWS.prototype = {
callService : function(method, parameters, options)
{
if (options)
{
for (var prop in options)
this.options[prop] = options[prop];
}
try { this.xhr = new XMLHttpRequest();}
catch(e) {
try { this.xhr = new ActiveXObject('Msxml2.XMLHTTP'); }
catch(e) {
try { this.xhr = new ActiveXObject('Microsoft.XMLHTTP'); }
catch (e){
this.error(0, "Cannot create request object");
return;
}
}
}
this.xhr.onreadystatechange = pwgBind(this, this.onStateChange);

var url = this.urlRoot+"ws.php?format=json&method="+method;

var body = "";
if (parameters)
{
for (var prop in parameters)
{
if ( typeof parameters[prop] == 'object' && parameters[prop])
{
for (var i=0; i<parameters[prop].length; i++)
body += prop+"[]="+encodeURIComponent(parameters[prop][i])+"&";
}
else
body += prop+"="+encodeURIComponent(parameters[prop])+"&";
}
}

if (this.options.method != "POST" )
{
url += "&"+body;
body = null;
}
this.xhr.open(this.options.method, url, this.options.async);
if (this.options.method == "POST" )
this.xhr.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
try {
this.xhr.send(body);
} catch(e) {
this.error(0, e.message);
}
},

onStateChange: function() {
var readyState = this.xhr.readyState;
if (readyState==4)
{
try {
this.respondToReadyState(readyState);
} finally {
this.cleanup();
}
}
},

error: function( httpCode, text )
{
!this.options.onFailure || this.options.onFailure( httpCode, text);
this.cleanup();
},

respondToReadyState: function(readyState)
{
var xhr = this.xhr;
if (readyState==4 && xhr.status == 200)
{
var resp;
try {
resp = window.JSON && window.JSON.parse ? window.JSON.parse( xhr.responseText ) : (new Function("return " + xhr.responseText))();
}
catch (e) {
this.error( 200, e.message + '\n' + xhr.responseText.substr(0,512) );
}
if (resp!=null)
{
if (resp.stat==null)
this.error( 200, "Invalid response" );
else if (resp.stat=='ok')
!this.options.onSuccess || this.options.onSuccess( resp.result );
else
this.error( 200, resp.err + " " + resp.message);
}
}
if (readyState==4 && xhr.status != 200)
this.error( xhr.status, xhr.statusText );
},

cleanup: function()
{
if (this.xhr) this.xhr.onreadystatechange = null;
this.xhr = null;
this.options.onFailure = this.options.onSuccess = null;
},

xhr: null
}

function pwgAddEventListener(elem, evt, fn)
{
if (window.addEventListener)
elem.addEventListener(evt, fn, false);
else
elem.attachEvent('on'+evt, fn);
}