function sendAjaxRequest(url, type, params, successMethod){

	var http;
		   var browser = navigator.appName;
		   if(browser == "Microsoft Internet Explorer"){
			   http = new ActiveXObject("Microsoft.XMLHTTP");
		   }else{
			   http = new XMLHttpRequest();
		   }

		   http.open(type, url, true); 
		   
		   http.onreadystatechange = function(){
			   if(http.readyState == 4){
				   if(http.status == 200){
					   var response = http.responseText;
					   successMethod(response);
			   		}else{
			   			alert("internal error");
			   		}
			   }
		   }
		   
		   http.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
		   http.setRequestHeader("Content-length", 0);
		   http.setRequestHeader("Connection", "close");
		   
		   http.send(params);
}