/* drop down menu */
function dropdown(obj,stat) {
	idx=fDOM(obj);
	idx.style.visibility=(stat) ? "visible" : "hidden";
}
function fDOM(obj) {
	if (document.getElementById) return (document.getElementById(obj));
	else return (0);
}

/* generic pop-up window */
function popUp(URL) {
	day = new Date();
	id = day.getTime();
	eval("page" + id + " = window.open(URL, '" + id + "', 'toolbar=0,scrollbars=0,location=0,statusbar=0,menubar=0,resizable=0,width=825,height=618,left=200,top=200');");
}

/* image swap on hover */
function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}

function changeImages() {
	if (document.images && (preloadFlag == true)) {
		for (var i=0; i<changeImages.arguments.length; i+=2) {
			document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
		}
	}
}

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_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];}
}

/* paypal form validation */
function fnUpdatePayPalForm(f) {
	if (!isNumeric(f.quantity.value)) {
		f.quantity.focus();
		alert('Please enter a numeric quantity');
		return false;
	}
	if (f.quantity.value=='') {
		f.quantity.value = 1;
	}
	if (f.quantity.value > f.stockOnHand.value) {
		f.quantity.value = f.stockOnHand.value;
		alert("Sorry, there are only "+f.stockOnHand.value+ " in stock at the moment.");
		return false;
	}
	return true;
}

function isNumeric(val) {
	var ValidChars = "0123456789";
	for (i=0; i<val.length; i++) if (ValidChars.indexOf(val.charAt(i)) == -1) return false;
	return true;
}

function validateAddToCart(){
		cartQuantity = 0;
		$('.quantity').each(function(){
			cartQuantity += $(this).val();
		});
		if (cartQuantity == 0) {
			alert('You must select a quantity to add an item to your cart.');
			return false;
		} else {
			return true;
		}
	}