//xmlhttp.js
//Function to create an XMLHttp Object.


function getxmlhttp (){
	//Create a boolean variable to check for a valid Microsoft active x instance.
	var xmlhttp = false;
	//Check if we are using internet explorer.
	try {
		//If the javascript version is greater than 5.
		xmlhttp = new ActiveXObject("Msxml2.XMLHTTP.XMLHTTP");
		//alert("active x");
	} catch (e) {
		//If not, then use the older active x object.
		try {
			//If we are using internet explorer.
			xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
			//alert("oude active x");
		} catch (E) {
			//Else we must be using a non-internet explorer browser.
			xmlhttp = false;
		}
	}
	// If not using IE, create a
	// JavaScript instance of the object.
	if (!xmlhttp && typeof XMLHttpRequest != 'undefined') {
		xmlhttp = new XMLHttpRequest();
	}
	
	return xmlhttp;
}

var output = "";
//Function to process an XMLHttpRequest.
function processajax (serverPage, obj, getOrPost, str, xmlhttp){
	var a = new Date();
	serverPage = serverPage + "&a=" + a.getTime();
	//Get an XMLHttpRequest object for use.
	if(!xmlhttp){
		xmlhttp = getxmlhttp ();
	}
		
	//obj = window.document.getElementById(obj);
	output = "";
	//alert(xmlhttp);
	if (getOrPost == "GET"){
		xmlhttp.open("GET", serverPage);
		xmlhttp.setRequestHeader("If-Modified-Since", "Wed, 15 Nov 1995 04:58:08 GMT")
		xmlhttp.onreadystatechange = function() {			
			if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
				var newdiv = window.document.createElement("div");
				newdiv.innerHTML = xmlhttp.responseText;
				obj.innerHTML = "";
				obj.appendChild(newdiv);	
			}			
		}
		xmlhttp.send(null);
	} 
	else {
		xmlhttp.open("POST", serverPage, true);
		xmlhttp.setRequestHeader("Content-Type","application/x-www-form-urlencoded; charset=UTF-8");
		xmlhttp.setRequestHeader("If-Modified-Since", "Wed, 15 Nov 1995 04:58:08 GMT")
		xmlhttp.onreadystatechange = function() {
			if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
				var newdiv = window.document.createElement("div");
				newdiv.innerHTML = xmlhttp.responseText;
				obj.innerHTML = "";
				obj.appendChild(newdiv);

			}
		}
		xmlhttp.send(str);
	}
	
	return output;
}

// om fout met DIV te voorkomen
function vulDiv(div, content){
	try{
		var parentDiv = window.document.getElementById(div);
		var newdiv = window.document.createElement("div");
		newdiv.innerHTML = content;
		
		// hoofd div leegmaken
		parentDiv.innerHTML = "";
		parentDiv.appendChild(newdiv);
		return true;
	}
	catch (e){
		alert(e.message)
		return false;	
	}
}

// loader tonen
function toonLoader(){
	return '<div style="text-align:center; padding-top:20px;"><img src="images/ajax-loader.gif" width="16" height="16" />&nbsp;</div>';
}