sfHover = function() {
	var sfEls = document.getElementById("nav").getElementsByTagName("LI");
	for (var i=0; i<sfEls.length; i++) {
		sfEls[i].onmouseover=function() {
			this.className+=" sfhover";
		}
		sfEls[i].onmouseout=function() {
			this.className=this.className.replace(new RegExp(" sfhover\\b"), "");
		}
	}
}
if (window.attachEvent) window.attachEvent("onload", sfHover);

function chkF(field,alerttxt,reject){ with (field) { if (value==null||value==""||value==reject){ alert(alerttxt); return false; } else { return true } } }
function chkE(field,alerttxt){ with (field){ apos=value.indexOf("@"); dotpos=value.lastIndexOf("."); if (apos<1||dotpos-apos<2){ alert(alerttxt); return false; } else { return true; } } }

function contactform(thisForm) {
	with (thisForm){
		if (chkF(name, "Please enter your name.", "asd")==false){
			name.focus();
			return false;
		}
		
		if (chkE(email,"Sorry that isn't a valid Email Address")==false){
			email.focus();
			return false;
		}
		
		if (chkF(phone,"Please enter your Contact Number", "asd")==false){
			phone.focus();
			return false;
		}
		
		if (chkF(message, "Please enter a Message", "asd")==false){
			message.focus();
			return false;
		}
	}
}

function changeImg(img) { document.getElementById('mainimg').src = img.href; return false; }
function changeImgTwo(img) { document.getElementById('mainimgTwo').src = img.href; return false; }

var xmlHttp;
function stateChanged(cnt) {
	if (xmlHttp.readyState==4){  document.getElementById("order").innerHTML = xmlHttp.responseText; }
}

function GetXmlHttpObject(){
	var xmlHttp=null;
	try { xmlHttp = new XMLHttpRequest(); }
	catch (e) {
		try { xmlHttp = new ActiveXObject("Msxml2.XMLHTTP"); }
		catch (e) {xmlHttp = new ActiveXObject("Microsoft.XMLHTTP"); }
	}
	return xmlHttp;
}

function changeContent(pd, vr, pg, img){ 
	xmlHttp=GetXmlHttpObject();
	if (xmlHttp==null){
		alert ("Your browser does not support AJAX!");
		return;
	}
	changeImg(img);
	var url= "/productinfo.php?pd="+pd+"&vr="+vr+"&pg="+pg;
	xmlHttp.onreadystatechange = stateChanged;
	xmlHttp.open("GET",url,true);
	xmlHttp.send(null);
	return false;
}

function updateprice(sel) {
	num = sel.id.split("_"); num = num[1];
	price = document.getElementById('itm_price_' + num).value;
	quantity = document.getElementById("quantity_" + num).value;
	item_cost = (price * quantity).toFixed(2);
	if(document.getElementById("delivery_" + num).value == 'sco') { item_cost = Number(item_cost) + 10; }
	document.getElementById('totprice_' + num).innerHTML = "£" + item_cost.toFixed(2);
	
	ob = document.getElementById('accessories_' + num);
	selected = new Array();
	for (var i = 0; i < ob.options.length; i++) {
		if (ob.options[ i ].selected) {
			selected.push(ob.options[ i ].value);
		}
	}
	alert(selected);
}

function isNumber(n) {
	return !isNaN(parseFloat(n)) && isFinite(n);
}



function OLDupdateprice(sel) {
	num = sel.name.split("_"); num = num[1];
	price = document.getElementById('itm_price_' + num).value;
	delivery = document.getElementById("delivery_" + num).value;
	freq = document.getElementById("del_freq_" + delivery + "_" + num).value;
	cost = document.getElementById("del_price_" + delivery + "_" + num).value;
	quantity = document.getElementById("quantity_" + num).value;
	item_cost = (price * quantity).toFixed(2);
	delivery_num = Math.ceil(quantity / freq);
	delivery_num *= cost
	document.getElementById('totprice_' + num).innerHTML = "£" + (Number(delivery_num) + Number(item_cost)).toFixed(2);
}