// JavaScript Document
function imAjax() {
	this.req = null;
	this.url = null;
	this.method = 'GET';
	this.async = true;
	this.status = null;
	this.statusText = '';
	this.postData = null;
	this.readyState = null;
	this.responseText = null;
	this.responseXML = null;
	this.handleResp = null;
	this.responseFormat = 'text', // 'text', 'xml', or 'object'
	this.mimeType = null;
	
	this.init = function() {
		if (!this.req) {
			try {
				// Firefox, Safari, IE7
				this.req = new XMLHttpRequest();	
			} 
			catch (e) {
				try {
					// IE
					this.req = new ActiveXObject("MSXML2.XMLHTTP");
				}
				catch (e) {
					try {
						// earlier versions of IE
						this.req = new ActiveXObject("Microsoft.XMLHTTP");
					}
					catch (e) {
						return false;
					}
				}
			}
		}
		return this.req;
	};

	this.doReq = function(fn) {
		if (!this.init()) {
			alert('Could not create XMLHttpRequest Object');
			return;
		}
		this.req.open(this.method, this.url, this.async);
		if (this.method == "POST") {
			this.req.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
		}
		if (this.mimeType) {
			try {
				req.overrideMimeType(this.mimeType);
			}
			catch (e) {
				// couldn't overide
			}
		}
		var self = this; //Fix loss of scope
		this.req.onreadystatechange = function() {
			var resp = null;
			if (self.req.readyState == 4) {
				switch (self.responseFormat) {
					case 'text':
						resp = self.req.responseText;
						break;
					case 'xml':
						resp = self.req.responseXML;
						break;
					case 'object':
						resp = req;
						break;
				}
				if (self.req.status >= 200 && self.req.status <= 299) {
					//if (self.handleResp == 'self.showMenus') {
					//	bindCallBack(imCart.showMenus(resp));
					//} else if (self.handleResp == 'self.showProducts') {
					//	bindCallBack(imCart.showProducts(resp));
					//}
					//self.handleResp(resp);
					var funcName = eval(self.handleResp);
					bindCallBack(funcName(resp));
				} else {
					self.handleErr(resp);
				}
			}
		};
		this.req.send(this.postData);
	};

	this.setMimeType = function(mimeType) {
		this.mimeType = mimeType;
	};

	this.handleErr = function() {
		var errorWin;
		try {
			errorWin = window.open('', 'errorWin');
			errorWin.document.body.innerHTML = this.responseText;
		}
		catch (e) {
			alert('An error occurred, but the error message could not be displayed. \n'
				  + 'Status Code: ' + this.req.status + '\n'
			  	+ 'Status Description: ' + this.req.statusText);
		}
	};

	this.setHandleErr = function(funcRef) {
		this.handleErr = funcRef;
	};
	
	this.setHandlerResp = function(funcRef) {
    	this.handleResp = funcRef;
  	};

	this.setHandlerBoth = function(funcRef) {
		this.handleResp = funcRef;
		this.handleErr = funcRef;
	};

	this.abort = function() {
		if (this.req) {
			this.req.onreadystatechange = function() { };
			this.req.abort();
			this.req = null;
		}
	};

	this.doGet = function (url, fn, format) {
		this.url = url;
		this.handleResp = fn;
		this.responseFormat = format || 'text';
		this.doReq(fn);
	};
	
	this.doPost = function(url, postData, fn, format) {
		this.url = url;
		this.handleResp = fn;
		this.responseFormat = format || 'text';
		this.method = 'POST';
		this.postData = postData;
		this.doReq(fn);
	}
}