function PageQuery(q) {
if(q.length > 1) this.q = q.substring(1, q.length);
else this.q = null;
this.keyValuePairs = new Array();
if(q) {
for(var i=0; i < this.q.split("&").length; i++) {
this.keyValuePairs[i] = this.q.split("&")[i];
}
}
this.getKeyValuePairs = function() { return this.keyValuePairs; }
this.getValue = function(s) {
for(var j=0; j < this.keyValuePairs.length; j++) {
if(this.keyValuePairs[j].split("=")[0] == s)
return this.keyValuePairs[j].split("=")[1];
}
return false;
}
this.getParameters = function() {
var a = new Array(this.getLength());
for(var j=0; j < this.keyValuePairs.length; j++) {
a[j] = this.keyValuePairs[j].split("=")[0];
}
return a;
}
this.getLength = function() { return this.keyValuePairs.length; } 
}
function queryString(key){
var page = new PageQuery(window.location.search); 
return unescape(page.getValue(key)); 
}
function displayItem(key){
if(queryString(key)=='false') 
{
document.write("you didn't enter a ?name=value querystring item.");
}else{
document.write(queryString(key));
}
}
	function CalcPrice()
	{
		var price = 0;
		var basePrice = 1.10; 
		var brandFactor ;
		
		var form = document.calc;

		brandFactor = form.brand.value;
		
		// get base Price
		price = basePrice ;
		
		// apply quality discount
		price = price - form.quality.value;
		
		// apply length discount
		price = price - form.length.value;
		
		// apply add'l charges
		if (form.sterilization.checked) price = price + .5;
		if (form.packaging.checked) price = price + .25;
		if (form.overwrap.checked) price = price + .15;
		
		// apply brand factor
		price = price * brandFactor;
		
		// apply quantity
		price = price * form.quantity.value;
		
		price = "$" + price.toFixed(2);
		
		form.price.value = price;
		
	} // CalcPrice

	function ChangeBrand()
	{
		var form = document.calc;
		document.all["brandImage"].src = "brand-" + form.brand.value + ".jpg";
	} // ChangeBrand