xmlhttpCounter = 0;

function xmlhttp(strUrl, strSubmit, strMethod, strResultFunc, strDataType, strResponse) {
	// strUrl		= destination url
	// strSubmit	= querystring to submit
	// strMethod	= 'GET' or 'POST'
	// strResultFunc	= callback function
	// strDataType	= xml or txt
	// strResponse	= wait for response, true or false
	
	var xmlHttpReq = false;
	
    // Mozilla/Safari
    if (window.XMLHttpRequest) {
            xmlHttpReq = new XMLHttpRequest();
            xmlHttpReq.overrideMimeType('text/xml'); // probleem opera!
			xmlhttpCounter = xmlhttpCounter+1;
    }
    // IE
    else if (window.ActiveXObject) {
            xmlHttpReq = new ActiveXObject("Microsoft.XMLHTTP");
			xmlhttpCounter = xmlhttpCounter+1;
    }
	
	xmlHttpReq.open(strMethod, strUrl, strResponse);
    xmlHttpReq.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');

	if (strResponse){
		xmlHttpReq.onreadystatechange = function() {
			if (xmlHttpReq.readyState == 4) {
		        switch(strDataType){
					case "xml":
						input = xmlHttpReq.responseXML;
						break;
					case "text":
						input = xmlHttpReq.responseText;
						break;
				}
				eval(strResultFunc);
		    }
		}
	    xmlHttpReq.send(strSubmit);
	} else {
		xmlHttpReq.send(strSubmit);

		switch(strDataType){
			case "xml":
				input = xmlHttpReq.responseXML;
				break;
			case "text":
				input = xmlHttpReq.responseText;
				break;
		}
		eval(strResultFunc);
	}
	xmlhttpCounter = xmlhttpCounter-1;
}

function xmlhttp_checkConnections() {
	alert("connections: " + xmlhttpCounter);
}