var AUtility = {
	ajaxSend : function (url, callback) {
		var http_zadost = false;
		if (window.XMLHttpRequest) { // Mozilla, Safari, Opera, Konqueror...
			http_zadost = new XMLHttpRequest();
			if (http_zadost.overrideMimeType) {
			    http_zadost.overrideMimeType('text/xml');
			}
		} else if (window.ActiveXObject) { // Internet Explorer
			try {
				http_zadost = new ActiveXObject("Msxml2.XMLHTTP");
			} catch (e) {
				try {
					http_zadost = new ActiveXObject("Microsoft.XMLHTTP");
				} catch (e) {
					showErrorWindow('Odeslání selhalo.');
				}
			}
		}
		if (!http_zadost) {
			showErrorWindow('Odeslání selhalo.');
			return false;
		}
		var d = '&';
		if(url.search(/\?/) == -1){
			d = '?';
		}
		var r = AUtility.getRandomValue();
		url += d+'randomParam'+'='+r;
		http_zadost.open('GET', url, true);
		if (typeof callback == 'function') {
			http_zadost.onreadystatechange = function() {
				if (http_zadost.readyState == 4) {
					if (http_zadost.status == 200) {
				        callback(http_zadost.responseText);
					} else {
				        showErrorWindow('Odeslání selhalo.');
					}
				}
			}
		}
		http_zadost.send(null);
		return true;
	},
	issetBooleanCookie : function (name){
		var values = document.cookie.split(';');
		if (values.length){ 
			for ( var i in values ){ 
				if ((typeof values[i] == 'string') 
						&& (values[i].search(name+'=true') >= 0)){
					return true;
				}
			}
		}
		return false;	
	},
	setBooleanCookie : function (name){
		var vyprs = new Date(); 
		vyprs.setDate(vyprs.getDate() + 365); 
		document.cookie = name+"=true; expires="+vyprs.toGMTString()+"; path=/";
		return true;
	},
	ajaxSendPost : function  (url,params,callback) {	
		var http_ask = false;
		if (window.XMLHttpRequest) { // Mozilla, Safari, Opera, Konqueror...
			http_ask = new XMLHttpRequest();
			if (http_ask.overrideMimeType) {
			    http_ask.overrideMimeType('text/xml');
			}
		} else if (window.ActiveXObject) { // Internet Explorer
			try {
			    http_ask = new ActiveXObject("Msxml2.XMLHTTP");
			} catch (e) {
			    try {
			    	http_ask = new ActiveXObject("Microsoft.XMLHTTP");
			    } catch (e) {
			    	showErrorWindow('Odeslání selhalo. 1 ');
			    	return false;
			    }
			}
		}
		if (!http_ask) {
			showErrorWindow('Odeslání selhalo. 2 ');
			return false;
		}
		var r = AUtility.getRandomValue();
		params += '&randomParam='+r;
		http_ask.open('POST', url, true);	
		
		http_ask.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
		http_ask.setRequestHeader("Content-length", params.length);
		http_ask.setRequestHeader("Connection", "close");
		
		if (typeof callback == 'function') {
			http_ask.onreadystatechange = function() {
				if (http_ask.readyState == 4) {						
					if (http_ask.status == 200) {
						result = http_ask.responseText;						
						callback(result);
					} else {
						showErrorWindow('Odeslání selhalo. '+http_ask.status);
						return false;
					}
				}
			}
		}
		http_ask.send(params);		
	},
	getDivElement : function (id){
		var element = document.getElementById(id);
		//return (element instanceof HTMLDivElement) ? element : false;
		return element;
	},
	getRandomValue : function(){
		var r = Math.random();
		r = r.toString();
		return r.replace(/(\.)/,"");
	}
}