// JavaScript Document
// Holds an instance of XMLHttpRequest
var xmlHttp = createXmlHttpRequestObject();

// creates an XMLHttpRequest instance
function createXmlHttpRequestObject() 
{
	// will store the reference to the XMLHttpRequest object
	var xmlHttp;
	// this should work for all browsers except IE6 and older
	try
	{
		// try to create XMLHttpRequest object
		xmlHttp = new XMLHttpRequest();
	}
	catch(e)
	{
		// assume IE6 or older
		var XmlHttpVersions = new Array("MSXML2.XMLHTTP.6.0","MSXML2.XMLHTTP.5.0","MSXML2.XMLHTTP.4.0","MSXML2.XMLHTTP.3.0","MSXML2.XMLHTTP","Microsoft.XMLHTTP");
		
		// try every prog id until one works
		for(var i=0; i<XmlHttpVersions.length && !xmlHttp; i++)
		{
			try
			{
				// try to create XMLHttpRequest object
				xmlHttp = new ActiveXObject(XmlHttpVersions[i]);
			}
			catch (e)
			{
				// ignore potential error
			}
		}
	}
	
	// return the created object or display an error message
	if(!xmlHttp)
	{
		alert("Error creating the XMLHttpRequest object.");
	}
	else
	{
		return xmlHttp;
	}
}

// Read a file from the server
function process()
{
	// Send the message
	document.getElementById('result_left').innerHTML = "<h3>Calculating...</h3>";
			
	// Only continue if xmlHttp isn't void
	if(xmlHttp)
	{
		// Try to connect to the server
		try
		{
			var scount = 103;
var lcount = 109;
var ccount = 8;
			
			var sparam = "";
			var sparamc = 0;
			var lparam = "";
			var lparamc = 0;
			var cparam = "";
			var cparamc = 0;
			var bn = "";
			var i = 0;
						
			for(i=1;i<=scount;i++)
			{
				bn = "s_" + i;
				if(document.getElementById(bn).checked==true)
				{
					sparam += "&s_" + i + "=" + document.getElementById(bn).value;
					sparamc++;
				}
			}
			for(i=1;i<=lcount;i++)
			{
				bn = "l_" + i;
				if(document.getElementById(bn).checked==true)
				{
					lparam += "&l_" + i + "=" + document.getElementById(bn).value;
					lparamc++;
				}
			}
			for(i=1;i<=ccount;i++)
			{
				bn = "c_" + i;
				if(document.getElementById(bn).checked==true)
				{
					cparam += "&c_" + i + "=" + document.getElementById(bn).value;
					cparamc++;
				}
			}
			
			// Initiate the asynchronous HTTP request
			var rand = Math.floor(Math.random()*999999)
			xmlHttp.open("GET","/ajax-results.php?rand=" + rand + sparam + lparam + cparam,true);
			xmlHttp.onreadystatechange = handleRequestStateChange;
			xmlHttp.send(null);
		}
		catch(e)
		{
			// Display the error in case of failure
			//alert("Can't connect to server:\n" + e.toString());
		}
	}
}

// Functioncalled when the state of the HTTP request changes
function handleRequestStateChange()
{
	// When readystate is 4, we are ready to read the server response
	if(xmlHttp.readyState == 4)
	{
		// Continue only if HTTP status is OK
		if(xmlHttp.status == 200)
		{
			try
			{
				// Do something with the response from the server
				handleServerResponse();
			}
			catch(e)
			{
				// Display error message
				//alert("Error reading the response: " + e.toString());
			}
		}
		else
		{
			// Display stauts message
			//alert("There was a problem retrieving the data:\n" + xmlHttp.statusText);
		}
	}
}

// Handles the response received from the server
function handleServerResponse()
{
	// Retrieve the server's response
	var response = xmlHttp.responseText;	
	if(response == "0")
	{
		// Hide the go buttons
		var object = document.getElementById('go').style;
    	object.opacity = 0;
    	object.MozOpacity = 0;
    	object.KhtmlOpacity = 0;
    	object.filter = "alpha(opacity=0)";		
		
		var object = document.getElementById('gor').style;
    	object.opacity = 0;
    	object.MozOpacity = 0;
    	object.KhtmlOpacity = 0;
    	object.filter = "alpha(opacity=0)"; 
		
		// Send the message
		document.getElementById('result_left').innerHTML = "<h3>Your search returned no results</h3>";
	}
	else
	{
		// Show the go buttons
		var object = document.getElementById('go').style;
    	object.opacity = 100;
    	object.MozOpacity = 1;
    	object.KhtmlOpacity = 100;
    	object.filter = "alpha(opacity=100)";		
		
		var object = document.getElementById('gor').style;
    	object.opacity = 100;
    	object.MozOpacity = 1;
    	object.KhtmlOpacity = 100;
    	object.filter = "alpha(opacity=100)";  
		
		// Send the message		
		if(response > 1)
		{
			document.getElementById('result_left').innerHTML = "<h3>Your search returned <span class=\"num\">" + response + "</span> results.</h3>";
		}
		else
		{
			document.getElementById('result_left').innerHTML = "<h3>Your search returned <span class=\"num\">" + response + "</span> result.</h3>";
		}
	}	
}