//Create a boolean variable to check for a valid Internet Explorer instance.
var xmlhttp = false;

//Check if we are using IE.
try {
	//If the Javascript version is greater than 5.
	xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
} catch (e) {
	//If not, then use the older active x object.
	try {
		//If we are using MS.
		xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
	} catch (E) {
		//Else we must be using a non-IE browser.
		xmlhttp = false;
	}
}

//If we are using a non-IE browser, create a javascript instance of the object.
if (!xmlhttp && typeof XMLHttpRequest != 'undefined') {
	xmlhttp = new XMLHttpRequest();
}


function makerequest(siteroot,serverPage, objID,dd1,idmenuitem) {
	var idx = dd1.selectedIndex;
  	var val = dd1[idx].text;
	if ((val == null) || (val == "")) val=0;
	if ((idmenuitem == null) || (idmenuitem == "")) return;
	var obj = document.getElementById(objID);
	xmlhttp.open("GET", siteroot+serverPage+"?num="+escape(val)+"&idmenuitem="+escape(idmenuitem));
	xmlhttp.onreadystatechange = function() {
		if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
			obj.innerHTML 		= xmlhttp.responseText;
			subtotalArrElements	= getElementsByClassName(document,"td","val");
			
			total=0.00;
			for (i=0;i<subtotalArrElements.length;i++){
				total+=parseFloat(subtotalArrElements[i].innerHTML);
			}
		document.getElementById("menutotal").innerHTML="&pound;"+decimalToCurrencyString(total)+"<br>+VAT";
		}
	}
	xmlhttp.send(null);
}	



function getElementsByClassName(oElm, strTagName, strClassName){
	var arrElements = (strTagName == "*" && oElm.all)? oElm.all : oElm.getElementsByTagName(strTagName);
	var arrReturnElements = new Array();
	strClassName = strClassName.replace(/\-/g, "\\-");
	var oRegExp = new RegExp("(^|\\s)" + strClassName + "(\\s|$)");
	var oElement;
	for(var i=0; i<arrElements.length; i++){
		oElement = arrElements[i];
		if(oRegExp.test(oElement.className)){
			arrReturnElements.push(oElement);
		}
	}
	return (arrReturnElements);
}

function decimalToCurrencyString(amount){
amount=parseFloat(amount);
if (amount==0){return "0.00";}
amount = Math.round(amount*100).toString();
amount = amount.substring(0,amount.length-2)+'.'+
amount.substring(amount.length-2,amount.length);
return amount;
}