/**
 * @author Anthony
 */


var ajaxObj = {
	req:null,
	url:null,
	method:'GET',
	async:true,
	status:null,
	statusText:'',
	postData:null,
	readyState:null,
	responseText:null,
	responseXML:null,
	handleResp:null,
	responseFormat:'text', // text, xml, object
	rhContentType:null, // used with POST
	mimeType:null,
	
	init:function() {
		if(!this.req) {
			try{
				this.req = new XMLHttpRequest();
			}
			catch(e) {
				try{
					this.req = new ActiveXObject('MSXML2.XMLHTTP');
				}
				catch(e){
					try{
						this.req = new ActiveXObject('Microsoft.XMLHTTP');
					}
					catch(e){
						return false;
					}
				}
			}
		}
		return this.req;
	},
	
	doReq:function() {
		if(!this.init()) {
			alert('Could not create XMLHttpRequest object.');
			return;
		}
		this.req.open(this.method,this.url,this.async);
		if(this.rhContentType) {
			this.req.setRequestHeader('Content-type',this.rhContentType);
			this.rhContentType = null;
		}
		if(this.mimeType) {
			try{
				req.overrideMimeType(this.mimeType);
			}
			catch(e) {
				// couldn't override MIME type
			}
		}
		var self = this;
		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) {
					self.handleResp(resp);
				}
				else{
					self.handleErr(resp);
				}
			}
		};
		this.req.send(this.postData);
	},
	
	setMimeType:function(mimeType) {
		this.mimeType = mimeType;
	},
	
	handleErr:function() {
		var errorWin;
		try {
			errorWin = window.open('','errorWin');
			errorWin.document.body.innerHTML = this.responseText;
		}
		catch(e) {
			alert('An error occured, but this error message could not displayed.\n'
			  + 'This is probably because of your browser\'s pop-up blocker.\n'
			  + 'Please allow pop-ups from this web site if you want to see the full error message.\n'
			  + '\n'
			  + 'Status Code: ' + this.req.status + '\n'
			  + 'Status Description: ' + this.req.statusText);
		}
	},
	
	abort:function(){
		if(this.req) {
			this.req.onreadystatechange = function(){};
			this.req.abort();
			this.req = null;
		}
	},
	
	doGet:function(url,hand,format) {
		this.url = url;
		this.handleResp = hand;
		this.responseFormat = format || 'text';
		this.doReq();
	}
};