function Hijax()
{
	var container,url,canvas,data,loading,callback,request;
	this.setContainer = function(value)
	{
		container = value;
	};
	this.setUrl = function(value)
	{
		url = value;
	};
	this.setCanvas = function(value)
	{
		canvas = value;
	};
	this.setLoading = function(value)
	{
		loading = value;
	};
	this.setCallback = function(value)
	{
		callback = value;
	};
	this.captureData = function()
	{
		if (container.nodeName.toLowerCase() == "form")
		{
			container.onsubmit = function() {
				var query = "";
				for (var i=0; i<this.elements.length; i++)
				{
					query+= this.elements[i].name;
					query+= "=";
					query+= escape(this.elements[i].value);
					query+= "&";
				}
				data = query;
				return !start();
			};
		}
		else
		{
			var links = container.getElementsByTagName("a");
			for (var i=0; i<links.length; i++)
			{
				links[i].onclick = function() {
					var query = this.getAttribute("href").split("?")[1];
					url+= "?"+query;
					return !start();
				};
			}
			links = null;
		}
	};
	var start = function()
	{
		request = getHTTPObject();
		if (!request || !url)
		{
			return false;
		}
		else
		{
			initiateRequest();
			return true;
		}
	};
	var getHTTPObject = function()
	{
		var xmlhttp = false;
		if (window.XMLHttpRequest)
		{
			xmlhttp = new XMLHttpRequest();
		}
		else if(window.ActiveXObject)
		{
			try 
			{
				xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
			} 
			catch (e) 
			{
				try 
				{
					xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
				} 
				catch (e) 
				{
					xmlhttp = false;
				}
			}
		}
		return xmlhttp;
	};
	var initiateRequest = function() {
		if (loading) 
		{
			loading();
		}
		request.onreadystatechange = completeRequest;
		if (data)
		{
			request.open("POST", url, true);
			request.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
			request.send(data);
		}
		else
		{
			request.open("GET", url, true);
			request.send(null);
		}
	};
	var completeRequest = function()
	{
		if (request.readyState == 4) {
			if (request.status == 200 || request.status == 304)
			{
				if (canvas)
				{
					canvas.innerHTML = request.responseText;
				}
				if (callback) {
					callback();
				}
			}
		}
	};
}

function Contact()
{
	var setHidden = function()
	{
		var ajax = document.createElement("input");
		ajax.setAttribute("type", "hidden");
		ajax.setAttribute("name", "ajax");
		ajax.setAttribute("value", "true");
		document.getElementById("contactus").appendChild(ajax);
	};
	var prepareForm = function(element)
	{
		setHidden();
		var xhr = new Hijax();
		xhr.setContainer(element);
		xhr.setUrl("send_form.php");
		xhr.setCanvas(document.getElementById("canvas"));
		xhr.setLoading(function() 
		{
			displayLoading(document.getElementById("canvas"));
		});
		xhr.captureData();
	};
	
	var displayLoading = function(element)
	{
		document.getElementById("canvas").innerHTML	= "";
		var image = document.createElement("img");
		image.setAttribute("alt","loading...");
		image.setAttribute("src","img/loading.gif");
		image.className = "loading";
		element.appendChild(image);
	};
	
	prepareForm(document.getElementById("contactus"));
}

window.onload = Contact;