var jsmx = new jsmxConstructor();
function jsmxConstructor(){
	this.isJSMX = true;
	this.async = true;
	this.debug = false;
	this.waitDiv = 'JSMX_loading';
	this.http = http;
	this.onWait = _popWait;
	this.onWaitEnd = _killWait;
	this.onError = _onError;
}

// perform the XMLHttpRequest();
function http(verb,url,cb,q) {
	var self = (this.isJSMX) ? this : jsmx ;
	//reference our arguments
	var qryStr = (!q) ? '' : _toQueryString(q);
	var calledOnce = false; //this is to prevent a bug in onreadystatechange... "state 1" gets called twice.
	try{//this should work for most modern browsers excluding: IE Mac
		var xhr = ( window.XMLHttpRequest ) ? new XMLHttpRequest() : new ActiveXObject("Microsoft.XMLHTTP") ;
			xhr.onreadystatechange = function(){
				switch(xhr.readyState){
                    case 0: break; // uninitialized 
					case 1: // loading
						if(!calledOnce){ 
							self.onWait(self.waitDiv); 
							calledOnce = true;
						} 	break;
					case 2: break; // loaded
					case 3: break; // interactive
					case 4: // complete
						self.onWaitEnd(self.waitDiv);
						if ( xhr.status == 200 ){// only if "OK"
							var success = true;
							try{
								var rObj = _parseResponse( xhr );
							}catch(e){ 
								self.onError(xhr,self,1);
								success = false;
							}
							if(success){ cb( rObj ); }
						}else{
							self.onError(xhr,self,2);
						}
					delete xhr; //clean this function from memory once we re done with it.
					break;
				}
			};
			xhr.open( verb , _noCache(url) , self.async );
			if(verb.toLowerCase() == 'post') { xhr.setRequestHeader("Content-Type", "application/x-www-form-urlencoded"); }
			xhr.send(qryStr);
	}catch(e){
		self.onError(xhr,self,3);
	}
}

/*--- BEGIN: RESPONSE PARSING FUNCTIONS ---*/
function _parseResponse($$){
	var str = _cleanString($$.responseText);
	var xml = $$.responseXML;
	// TRY IT AS XML
	    if(xml != null && xml.childNodes.length){ return xml; } 
	// TRY IT AS JSON
		try{ return eval('('+str+')'); }
	// TRY IT AS JavaScript
		catch(e){ return _parseJS(str); }
}

function _cleanString(str){ 
	//Left Trim
	var rex = /\S/i;
	str = str.substring(str.search(rex),str.length);
	
	var i = str.indexOf("HTTP/1");
	if (i > -1) {
		str = str.substring(i, str.length);
		i = str.indexOf(String.fromCharCode(13, 10, 13, 10));
		if (i > -1) { str = str.substring(i + 2, str.length); }
	}
	return str;	
}
function _parseJS(str){ 
	eval(str);
	var r = eval(str.split('=')[0].replace(/\s/g,''));
	return r;
}
 
function xmlStr2Doc(str) { 
    var xml; 
    if(typeof(DOMParser) == 'undefined') { 
        xml=new ActiveXObject("Microsoft.XMLDOM"); 
        xml.async="false"; xml.loadXML(str); 
    } else { 
        var domParser = new DOMParser(); 
        xml = domParser.parseFromString(str, 'application/xml'); 
    } 
    return xml; 
} 

/*--- END: RESPONSE PARSING FUNCTIONS ---*/


/*--- BEGIN: REQUEST PARAMETER FUNCTIONS ---*/
	function _toQueryString(obj){
		//determine the variable type
		if(typeof(obj) == 'string') { return obj; }
		if(typeof(obj) == 'object'){
			if(typeof obj.elements == 'undefined') {return _object2queryString(obj); }//It's an Object()!
			else{ return _form2queryString(obj); }//It's a form!
		}	
	}	
	function _object2queryString(obj){
		var ar = new Array();
		for(x in obj){ ar[ar.length] = _escape_utf8(x)+'='+_escape_utf8(obj[x]); }
		return ar.join('&');
	}	
	function _form2queryString(form){
		var obj = new Object();
		var ar = new Array();
		for(var i=0;i < form.elements.length;i++){
			try {
				elm = form.elements[i];
				nm = elm.name;
				if(nm != ''){
					switch(elm.type.split('-')[0]){
						case "select":
							for(var s=0;s < elm.options.length;s++){
								if(elm.options[s].selected){
									if(typeof(obj[nm]) == 'undefined'){ obj[nm] = new Array(); }
									obj[nm][obj[nm].length] = _escape_utf8(elm.options[s].value);
								}	
							}
							break;						
						case "radio":
							if(elm.checked){
								if(typeof(obj[nm]) == 'undefined'){ obj[nm] = new Array(); }
								obj[nm][obj[nm].length] = _escape_utf8(elm.value);
							}	
							break;						
						case "checkbox":
							if(elm.checked){
								if(typeof(obj[nm]) == 'undefined'){ obj[nm] = new Array(); }
								obj[nm][obj[nm].length] = _escape_utf8(elm.value);
							}	
							break;						
						default:
							if(typeof(obj[nm]) == 'undefined'){ obj[nm] = new Array(); }
							obj[nm][obj[nm].length] = _escape_utf8(elm.value);
							break;
					}
				}
			}catch(e){}
		}
		for(x in obj){ ar[ar.length] = x+'='+obj[x].join(','); }
	return ar.join('&');
	}
/*--- END: REQUEST PARAMETER FUNCTIONS ---*/

//IE likes to cache so we will fix it's wagon!
function _noCache(url){
	var qs = new Array();
	var arr = url.split('?');
	var scr = arr[0];
	if(arr[1]){ qs = arr[1].split('&'); }
	qs[qs.length]='noCache='+new Date().getTime();
return scr+'?'+qs.join('&');
}
function _popWait(id){ 
	proc = document.getElementById(id);
	if( proc == null ){
		var p = document.createElement("div");
		p.id = id;
		document.body.appendChild(p);
	}
}
function _killWait(id){
	proc = document.getElementById(id);
	if( proc != null ){ document.body.removeChild(proc); }
}
function _onError(obj,inst,errCode){ 
	var msg;
	switch(errCode){
		case 1:/*parsing error*/
			msg = (inst.debug) ? obj.responseText : 'Parsing Error: The value returned could not be evaluated.';
			break;
		case 2:/*server error*/
			msg = (inst.debug) ? obj.responseText : 'There was a problem retrieving the data:\n' + obj.status+' : '+obj.statusText;
			break;
		case 3:/*browser not equiped to handle XMLHttp*/
			msg = 'Unsupported browser detected.';
			return;/*you can remove this return to send a message to the screen*/
			break;		
	}		
	if(inst.debug){
		var debugWin = window.open('','error');
		debugWin.document.write(msg);
		debugWin.focus();
	}else{
		alert(msg);
	}
}

function _escape_utf8(data) {
	if (data=="" || data == null){ return ""; }
	data = data.toString();
	var buf = "";
	for (var i=0;i<data.length;i++) {
		var c=data.charCodeAt(i);
		var bs = [];				
		if (c>0x10000) {
			bs[0] = 0xF0 | ((c & 0x1C0000) >>> 18);
			bs[1] = 0x80 | ((c & 0x3F000) >>> 12);
			bs[2] = 0x80 | ((c & 0xFC0) >>> 6);
			bs[3] = 0x80 | (c & 0x3F);
		} else if (c>0x800) {
			bs[0] = 0xE0 | ((c & 0xF000) >>> 12);
			bs[1] = 0x80 | ((c & 0xFC0) >>> 6);
			bs[2] = 0x80 | (c & 0x3F);
		} else  if (c>0x80) {
			bs[0] = 0xC0 | ((c & 0x7C0) >>> 6);
			bs[1] = 0x80 | (c & 0x3F);
		}
		else{
			bs[0] = c;
		}
		
		if (c == 10 || c == 13){ buf += '%0'+c.toString(16); }//added to correct problem with hard returns
		else if (bs.length == 1 && c>=48 && c<127 && c!=92){buf += data.charAt(i);}
		else{ for(var j=0;j<bs.length;j++){ buf+='%'+bs[j].toString(16);} }
	}/**/
	return buf;
}