function HttpClient() { }
HttpClient.prototype = {
	requestType:'GET',
	isAsync:false,
	xmlhttp:false,
	callback:false,

	onSend:function() {
		document.getElementById('HttpClientStatus').style.display = 'block';
		},

	onload:function() {
		document.getElementById('HttpClientStatus').style.display = 'none';
		},

	onError:function(error) {
		alert(error);
		},

	init:function() {
		try {
			this.xmlhttp = new XMLHttpRequest();
			}
		catch (e) {
			var XMLHTTP_IDS = new Array('MSXML2.XMLHTTP.5.0','MSXML2.XMLHTTP.4.0','MSXML2.XMLHTTP.3.0','MSXML2.XMLHTTP','Microsoft.XMLHTTP');
			var success = false;
			for (var i=0;i < XMLHTTP_IDS.length && !success; i++) {
				try {
					this.xmlhttp = new ActiveXObject
					(XMLHTTP_IDS[i]);
					success = true;
					} 
				catch (e) {}
				}
			if (!success) {
				this.onError('Unable to create XMLHttpRequest.');
				}
			}
		},

    makeRequest:function(url,postdata) {
		if (!this.xmlhttp) {
			this.init();
			}
		this.xmlhttp.open(this.requestType,url,this.isAsync);
		
		var self = this;
		this.xmlhttp.onreadystatechange = function() {
			self._readyStateChangeCallback(); 
			}

		if (this.requestType=='POST') {
			this.xmlhttp.setRequestHeader('Content-type', 'application/x-www-form-urlencoded;charset=UTF-8;');
			}
		
		this.xmlhttp.send(postdata);
		
		if (!this.isAsync) {
			return this.xmlhttp.responseText;
			}
		},

    _readyStateChangeCallback:function() {
		switch(this.xmlhttp.readyState) {
		case 2:
			this.onSend();
			break;
		case 4:
			this.onload();
			if (this.xmlhttp.status == 200) {
				this.callback(this.xmlhttp.responseText);
				} 
			else {
				this.onError('HTTP Error Making Request: ['+this.xmlhttp.status+'] '+this.xmlhttp.statusText);
				}
			break;
			}
		},
	}