//Basic Ajax Routine- Author: Dynamic Drive (http://www.dynamicdrive.com)
//Last updated: Jan 15th, 06'

function createAjaxObj() {
	var httprequest = false;
	if (window.XMLHttpRequest) { // if Mozilla, Safari etc
		httprequest = new XMLHttpRequest();
		if (httprequest.overrideMimeType) {
			httprequest.overrideMimeType('text/xml');
		}
	}
	else if (window.ActiveXObject){ // if IE
		try {
			httprequest=new ActiveXObject("Msxml2.XMLHTTP");
		} 
		catch (e) {
			try {
				httprequest=new ActiveXObject("Microsoft.XMLHTTP");
			}
			catch (e) {}
		}
	}
	
	return httprequest;
}

var ajaxpack = new Object();
ajaxpack.basedomain = "http://"+window.location.hostname;
ajaxpack.ajaxobj = createAjaxObj();
ajaxpack.filetype = "txt";
ajaxpack.addrandomnumber = 0; //Set to 1 or 0. See documentation.

ajaxpack.getAjaxRequest = function(url, parameters, callbackfunc, filetype) {
	ajaxpack.ajaxobj = createAjaxObj(); //recreate ajax object to defeat cache problem in IE
	if (ajaxpack.addrandomnumber == 1) //Further defeat caching problem in IE?
		var parameters=parameters+"&ajaxcachebust="+new Date().getTime();

	if (this.ajaxobj) { 
		this.filetype = filetype;
		this.ajaxobj.onreadystatechange = callbackfunc;
		this.ajaxobj.open('GET', url+"?"+parameters, true);
		this.ajaxobj.send(null);
	}
}

ajaxpack.postAjaxRequest = function(url, parameters, callbackfunc, filetype) {
	ajaxpack.ajaxobj = createAjaxObj(); //recreate ajax object to defeat cache problem in IE
	if (this.ajaxobj) {
		this.filetype = filetype
		this.ajaxobj.onreadystatechange = callbackfunc;
		this.ajaxobj.open('POST', url, true);
		this.ajaxobj.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
		this.ajaxobj.setRequestHeader("Content-length", parameters.length);
		this.ajaxobj.setRequestHeader("Connection", "close");
		this.ajaxobj.send(parameters);
	}
}