/* This is a multi-dimensional array containing all the attribute
   variations for a particular product.  For example, the product might
   be a Viper, and the variations might be 3 types of colors and 4 types of 
   weights */
var productList = new Array();

function Product(name, price, img_path) {
	this.name = name;
	this.price = price;
	this.img_path = img_path;
}

// The first 3 arguments to this need to be as follows:
//	product name
//	price
//	path to image of product
// Afterwards,  a variable list of arguments that are product attributes.
function addProduct() {
	var name = arguments[0];
	var price = arguments[1];	
	var img_path = arguments[2];
	var expr = "productList";	
	for (var i=3; i<arguments.length; i++) {
		expr += "['" + arguments[i] + "']";
		// We attempt to see if this attribute has already been
		// defined in the multidimensional array.  If it has not, 
		// we assign it a new array.
		if (!eval(expr)) {
			eval(expr + " = new Array();");
		}
	}
	// Now assign the price for all the given attributes.
	eval(expr + " = new Product('" + name + "', " + price + ", '" + img_path + "');");	
}

function updatePrice(productForm) {
	var priceExpr = "productList";	
	for (var i=0; i<productForm.elements.length; i++) {
		var elt = productForm.elements[i];
		// Only check the element if it is a SELECT menu.
		if (elt.selectedIndex) {
			if (elt.selectedIndex < 1) {
				document.getElementById('p').value = '';
				document.getElementById('amount').value = '';
				return;
			} else {
				priceExpr += "['" + elt.value + "']";
			}
		}
	}

	// It is possible that there a combination of attributes for which 
	// there is no product in the inventory.  If so, an exception is 
	// generated and the price fields are set to null.
	var validPrice = false;
	try {
		var price = parseFloat(eval(priceExpr + ".price"));
		validPrice = (price - 0 == price);;
	} catch (e) {
		validPrice = false;
	}

	if (validPrice) {	
		document.getElementById('amount').value = formatPrice(price);
		showButton();
	} else {
		document.getElementById('amount').value = '';
		hideButton();
	}
}

function buyIt(productForm) {
	for (var i=0; i<productForm.elements.length; i++) {
		var elt = productForm.elements[i];
		// Only check the element if it is a SELECT menu.
		if (elt.selectedIndex) {
			if (elt.selectedIndex < 1) {
				alert("Please make sure you select a value for all attributes.");	
				return;
			} 
		}
	}
	
	productForm.elements['sourceurl'].value = "http://newtechtennis.com";
	/* productForm.elements['sourceurl'].value = location.href.substring(0, location.href.indexOf('?')) + '?name=' + escape(document.getElementById('name').value) + '&SubCategoriesID=' + document.getElementById('SubCategoriesID').value; 
	for (var i=0; i<productForm.elements.length; i++) {
		var elt = productForm.elements[i];
		// Only check the element if it is a SELECT menu.
		if (elt.selectedIndex) {
			productForm.elements['sourceurl'].value += "&" + elt.name + "=" + escape(elt.value); 
		}
	} */ 
	//productForm.elements['name'].value = productForm.elements['name'].value.toLowerCase();
	productForm.submit(); 
}

function formatPrice(value) {
     var ret = Math.round(value * 100).toString();
     var len = ret.length;
     if (len == 1) {ret = "00" + ret; len = 3}
     if (len == 2) {ret =  "0" + ret; len = 3}
     return ret.substring(0,len-2) + "." + ret.substring(len-2,len);
}


// These functions involve showing and hiding the 'Buy It' button
var netscape = (navigator.appName.toLowerCase().indexOf("netscape") > -1);
var ns4 = ((navigator.appVersion.charAt(0) == '4') && netscape);
var ie4 = (document.all)? true:false;
var gHide = (ns4) ? "hide" : "hidden";
var gShow = (ns4) ? "show" : "visible";

function showButton() {
        var id = 'Buy';
	var divObj = GetDivObject(id);
	divObj.visibility = gShow;
}

function hideButton(id) {
	var id = 'Buy';
	var divObj = GetDivObject(id);
	divObj.visibility = gHide;
}

function GetDivObject(id) {
	if (netscape) {
		return (!ns4) ? document.getElementById(id).style : document.layers[id];
	} else {
		return document.all[id].style;
	}
}