function getXMLHttpRequest() {
	if(window.ActiveXObject) {
		try {
			return new ActiveXObject("Msxml2.XMLHTTP");
		} catch(e) {
				try {
					return new ActiveXObject("Microsoft.XMLHTTP");
				} catch(e1) {
					return null;
				}
			}
		} else if (window.XMLHttpRequest) {
			return new XMLHttpRequest();
		} else {
			return null;
		}
	}

var httpRequest = null;

function sendRequest(url, params, callback, method) {
	httpRequest = getXMLHttpRequest();
	var httpMethod=method ? method : 'GET';

	if (httpMethod != 'GET' && httpMethod != 'POST') {
		httpMethod = 'GET';
	}
	var httpParams = (params == null || params == '') ? null : params;
	var httpUrl = url;
	if(httpMethod == 'GET' && httpParams != null) {
		httpUrl = httpUrl+"/"+httpParams;
		//alert(httpUrl);
	}
	httpUrl = httpUrl+"/"+httpParams;
	
	httpRequest.open(httpMethod, httpUrl, true);
	httpRequest.setRequestHeader('Content-Type','application/x-www-form-urlencoded');
	httpRequest.setRequestHeader("Content-length", httpParams.length);
	httpRequest.onreadystatechange = callback;
	httpRequest.send(httpMethod == 'POST' ? httpParams : null);
	
}