var replaceId = '';

//AJAX request stuff
function getRequest(parameters,docid) {
	request = false;
	if (window.XMLHttpRequest) { // Mozilla, Safari,...
		request = new XMLHttpRequest();
		if (request.overrideMimeType) {
			request.overrideMimeType('text/xml');
		}
	} else if (window.ActiveXObject) { // IE
		try {
			request = new ActiveXObject("Msxml2.XMLHTTP");
		} catch (e) {
			try {
				request = new ActiveXObject("Microsoft.XMLHTTP");
			} catch (e) {}
		}
	}
	
	if (!request) {
		alert('Cannot create XMLHTTP instance');
		return false;
	}
	
	replaceId = docid;
	request.onreadystatechange = requestReady;
	request.open('POST', 'ajax.php', true);
	request.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
	request.send(parameters);
}

function requestReady()
{
	if (request.readyState == 4 && request.status == 200) {
		result = request.responseText;
		document.getElementById(replaceId).innerHTML = result;
	}
}