// Version: 22-Jun-2009 
var AJAX = {
	getSynch : function(url, command, params){
		return AJAX.request("GET", url, command, params, false);
	},

	get : function(url, command, params){
		AJAX.request("GET", url, command, params, true);
	},

	post : function(url, command, params){
		AJAX.request("POST", url, command, params, true);
	},

	request : function(type, url, command, params, async)
	{
		var http_request = false;
		if(window.XMLHttpRequest) {
			http_request = new XMLHttpRequest();
		} else if (window.ActiveXObject) {
			try {
				http_request = new ActiveXObject("Msxml2.XMLHTTP");
			} catch (e) {
				try {
					http_request = new ActiveXObject("Microsoft.XMLHTTP");
				} catch (e) {
					// misschien error ofzo
				}
			}
		}

		if (!http_request) {
			// error?
			return false;
		}
		
		

		if (async){
			http_request.onreadystatechange = function() {
				AJAX.handle(http_request, command, params);
			};
		}

		http_request.open(type, url, async);
		if(type == "POST") {
			http_request.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
		}
		http_request.setRequestHeader("Cache-Control", "no-cache");
		http_request.send(null);

		if (!async){
			try {
				return http_request.responseText;
			}catch(ex){throw ex;}
		}
	},

	handle : function(http_request, command, params)
	{
		if(http_request.readyState == 4){
			if(http_request.status == 200){
				if(http_request.responseText != -1){
					if(command){
						command(http_request.responseText, params);
					}
				}
			} else {
				// error?
			}
		}
	},

	show : function(content)
	{
		alert(content);
	},

	replaceContent : function(content, params)
	{
		el(params.id).innerHTML = content;
		// voer javascripts uit in de opgehaalde html
		var scripts = el(params.id).getElementsByTagName("script");
		var head = document.getElementsByTagName("head")[0];
		for(var i=0;i<scripts.length;i++)
		{
			var script = document.createElement("script");
			script.type="text/javascript";
			// inline javascript
			if (scripts[i].text != '') {
				script.text=scripts[i].text;
			// externe javascript
			} else if (scripts[i].src != '') {
				script.src=scripts[i].src;
			}
			head.appendChild(script);
		}
		
	},

	appendContent : function(content, params)
	{
		if(params.id > 0){
			obj = el(params.id);
		}else{
			obj = document.getElementsByTagName("body")[0];
		}
		obj.innerHTML = obj.innerHTML + content;
	}
}

function refreshDiv(url, id, interval){
	AJAX.get(url, AJAX.replaceContent, {'id': id});
	if(interval > 0){
		setTimeout("refreshDiv('" + url + "','" + id + "'," + interval + ")", interval);
	}
}