var http = createRequestObject();
var objectId = '';

function createRequestObject(htmlObjectId){
    var obj;
    var browser = navigator.appName;

    objectId = htmlObjectId;

    if(browser == "Microsoft Internet Explorer"){
        obj = new ActiveXObject("Microsoft.XMLHTTP");
    }
    else{
        obj = new XMLHttpRequest();
    }

    return obj;    
}

function sendReq(serverFileName, variableNames, variableValues) {
	var paramString = '';

	variableNames = variableNames.split(',');
	variableValues = variableValues.split(',');

	for(i=0; i<variableNames.length; i++) {
		paramString += variableNames[i]+'='+variableValues[i]+'&';
	}

	paramString = paramString.substring(0, (paramString.length-1));

	if (paramString.length == 0) {
	   	http.open('get', serverFileName);
	}
	else {
		http.open('get', serverFileName+'?'+paramString);
	}
    http.onreadystatechange = handleResponse;
    http.send(null);
}

function handleResponse() {
	if(http.readyState == 4){
		responseText = http.responseText;
		document.getElementById(objectId).innerHTML = responseText;
    }
}