function roundNumber(num, dec) {
	var result = Math.round(num*Math.pow(10,dec))/Math.pow(10,dec);
	return result;
}


function createelement(name,value,cinteger){
var name = name + '_' + cinteger;
new_element = document.createElement("input");
new_element.setAttribute("type", "hidden");
new_element.setAttribute("name", name);
new_element.setAttribute("id", name);
new_element.setAttribute("value", value);
document.forms['form1'].appendChild(new_element); 

}


function Image1_onclick() {
var x = 0;
if (form1.quantity1.value != 0)
{
x = (x + 1);
createelement('quantity',form1.quantity1.value,x);
createelement('item_name','Knife Sharpening for up to 8 inch',x);
createelement('amount',(5-(.2*5)),x);

}
if (form1.quantity2.value != 0)
{
x = (x + 1);
createelement('quantity',form1.quantity2.value,x);
createelement('item_name','Knife Sharpening for 8 to 10 inch',x);
createelement('amount',(6-(.2*6)),x);
}
if (form1.quantity3.value != 0)
{
x = (x + 1);
createelement('quantity',form1.quantity3.value,x);
createelement('item_name','Knife Sharpening for 10 to 12 inch',x);
createelement('amount',(7-(.2*7)),x);
}
if (form1.quantity4.value != 0)
{
x = (x + 1);
createelement('quantity',form1.quantity4.value,x);
createelement('item_name','Knife Sharpening for 12 to 14 inch',x);
createelement('amount',(8-(.2*8)),x);
}
if (form1.quantity5.value != 0)
{
x = (x + 1);
createelement('quantity',form1.quantity5.value,x);
createelement('item_name','Knife Sharpening for 14 to 16 inch',x);
createelement('amount',(9-(.2*9)),x);
}
if (form1.quantity6.value != 0)
{
x = (x + 1);
createelement('quantity',form1.quantity6.value,x);
createelement('item_name','Knife Sharpening for 16 to 18+ inch',x);
createelement('amount',(10-(.2*10)),x);
}
if (x==0) {
alert ('You must enter at least one quantity greater than 0')
return false;
}






document.form1.action = "https://www.paypal.com/cgi-bin/webscr";
document.form1.method  = "post";
document.form1.target = "_Blank";






}

function update_total(){

var total = ((8)+(form1.quantity1.value * 5) + (form1.quantity2.value * 6) + (form1.quantity3.value * 7) + (form1.quantity4.value * 8) + (form1.quantity5.value * 9) + (form1.quantity6.value * 10) )
var discount = (.2*total)
var discounttotal = ((total-(total*.2))+0)
document.getElementById('total').innerHTML = '$' + roundNumber(total,2) + ' ';
document.getElementById('discount').innerHTML = '($' + roundNumber(discount,2) + ') ';
document.getElementById('discounttotal').innerHTML = '$' + roundNumber(discounttotal,2) + ' ';

}

function quantity_onchange1() {
document.getElementById('subtotal1').innerHTML = '$' + form1.quantity1.value * 5 + '       ';
update_total();
}

function quantity_onchange2() {
document.getElementById('subtotal2').innerHTML = '$' + form1.quantity2.value * 6 + '       ';
update_total();
}

function quantity_onchange3() {
document.getElementById('subtotal3').innerHTML = '$' + form1.quantity3.value * 7 + '       ';
update_total();
}

function quantity_onchange4() {
document.getElementById('subtotal4').innerHTML = '$' + form1.quantity4.value * 8 + '       ';
update_total();
}

function quantity_onchange5() {
document.getElementById('subtotal5').innerHTML = '$' + form1.quantity5.value * 9 + '       ';
update_total();
}

function quantity_onchange6() {
document.getElementById('subtotal6').innerHTML = '$' + form1.quantity6.value * 10 + '       ';
update_total();
}