var server_script_location = "/ajax/comments/comments.jsp";
/**
  *
  *
  *  The makePOSTRequest function handles the header
  * information of the http_request object.
  *
  *
  */
var http_request = false;
function makePOSTRequest(url, parameters) 
{
	http_request = false;
	if (window.XMLHttpRequest) 
	{ // Mozilla, Safari,...
		http_request = new XMLHttpRequest();
		if (http_request.overrideMimeType) 
		{
			// set type accordingly to anticipated content type
			//http_request.overrideMimeType('text/xml');
			http_request.overrideMimeType('text/html');
		}
	} else if (window.ActiveXObject) { // IE
		try {
			http_request = new ActiveXObject("Msxml2.XMLHTTP");
		} catch (e) {
			try {
				http_request = new ActiveXObject("Microsoft.XMLHTTP");
			} catch (e) {}
		}
	}

	if (!http_request) 
	{
		alert('Cannot create XMLHTTP instance');
		return false;
	}
      
	http_request.onreadystatechange = alertContents;
	http_request.open('POST', url, true);
	http_request.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
	http_request.setRequestHeader("Content-length", parameters.length);
	http_request.setRequestHeader("Connection", "close");
	http_request.send(parameters);
	
	document.getElementById('contentToBeUpdated').innerHTML = "<center><img src=\"/ajax/img/indicator.gif\"></center>"; 
	
}

/**
  * 
  *  alertContents function alerts the "contentToBeUpdated" span tag with the 
  *  response of the server.
  *
  */

function alertContents() 
{
	if (http_request.readyState == 4) 
	{
		if (http_request.status == 200) 
		{
			result = http_request.responseText;
			document.getElementById('contentToBeUpdated').innerHTML = result;            
		}else {
		
			alert("error :*(");
		}  
	}
}

/**
  *  Creates the actual request of the data we want to send.
  */   
function get(obj) 
{
	var poststr = "from=" + document.getElementById("from").value + 
				 "&comments=" + encodeURI( document.getElementById("comments").value );
	makePOSTRequest(server_script_location, poststr);
}