// Get the HTTP Object
function getHTTPObject(){
	if (window.ActiveXObject) return new ActiveXObject("Microsoft.XMLHTTP");
	else if (window.XMLHttpRequest) return new XMLHttpRequest();
	else {
		alert("Your browser does not support AJAX.");
		return null;
	}
}
// Change the value of the outputText field
function setOutput(){
	if(httpObject.readyState == 4){
		document.getElementById(tagId).value = httpObject.responseText;
	}
}
// Implement business logic
function doWork(arg, inTagId){
	httpObject = getHTTPObject();
	tagId = inTagId;
	if (httpObject != null) {
		//php-Datei auf dem Server aufrufen
		httpObject.open("GET", "ajax_f1_server.php?" + arg + "=" + document.getElementById('inputText').value, true);
		httpObject.send(null);
		httpObject.onreadystatechange = setOutput;
	}
}

var httpObject = null;