function Elements() {
	
	//Check php login session with an ajax load
	this.checkSession = function() {
		this.getAjaxElement('','ajax/check_login.php','slc');
		if(document.getElementById('slc').innerHTML == 'no') {
			window.location.replace("/");
		}
	}
	
	//ajax call function with get (not post)
	this.getAjaxElement = function(param,url,target) {
		var id;
		obj = document.getElementById(target);
		obj.innerHTML = "";
		if (window . XMLHttpRequest ) // FIREFOX
			xhr_object = new XMLHttpRequest () ;
		else if (window . ActiveXObject ) // IE
			xhr_object = new ActiveXObject ( "Microsoft.XMLHTTP" );
		else
			return(false) ;
		xhr_object . onreadystatechange = function() {
		if (xhr_object . readyState == 4 ) {
			if(xhr_object . status == 200 )
				obj . innerHTML += "" + xhr_object . responseText;
			else
			obj . innerHTML += "Error code " + xhr_object . status;
		}
		};
		var sendUrl = url + param;
		xhr_object . open ( "GET" , sendUrl , true);
		xhr_object . send (null );
	}

}