// JavaScript Document
<!--

function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}

function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

function MM_findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}

function MM_swapImage() { //v3.0
  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}






// global flag
var isIE = false;

var req;


//Call server with url
function loadXMLDoc(url) {
    // branch for native XMLHttpRequest object
    if (window.XMLHttpRequest) {
        req = new XMLHttpRequest();
        req.onreadystatechange = processReqChange;
        req.open("GET", url, true);
        req.send(null);
    // branch for IE/Windows ActiveX version
    } else if (window.ActiveXObject) {
        req = new ActiveXObject("Microsoft.XMLHTTP");
        if (req) {
            req.onreadystatechange = processReqChange;
            req.open("GET", url, true);
            req.send();
        }
    }
}

//Process response
function processReqChange() {
    // only if req shows "loaded"
    if (req.readyState == 4) {
        // only if "OK"
        if (req.status == 200) {
            handleResult();
        } else {
            alert("There was a problem retrieving the XML data:\n" +
                req.statusText);
        }
    }
}


// Set result text
function handleResult() {
	
	//Get item node from xml result.
    var items = req.responseXML.getElementsByTagName("item");

    // Get target span element
	oResult = document.getElementById("result");
	if(items.length > 0)
	{
		//Set result text
		oResult.innerHTML = items[0].firstChild.data;
		
		faderesult();
		
		//Check if alert chould be displayed
		if(document.getElementById("dispalert"))
		{
			if(document.getElementById("dispalert").checked)
			{
				alert("The result is " + items[0].firstChild.data);
			}
		}
	}
}


//Click event handler for add button
function addclick()
{
	//get values
	val1 = document.getElementById("val1").value;
	val2 = document.getElementById("val2").value;
	val3 = document.getElementById("val3").value;
	val4 = document.getElementById("val4").value;
	
	//call server
	loadXMLDoc("calc.php?class=" + val1 + "&res=" + val2 + "&meal=" + val3 + "&housing=" + val4);
}

// JavaScript Document
//-->