// JavaScript Document
// calculate price based on quantity
function changeQty(change){
    var currentQty = parseInt($F('quant')) // Where quant is the id of your quantity input field. Gets value of currentQty field
    
    switch (change) {
        case 'add':
            currentQty += 1
            $('quant').value = currentQty
            calculate()
            break
        case 'subtract':
            if (currentQty > 1) { // only subtract if qty is greater than zero
                currentQty -= 1
                $('quant').value = currentQty
                calculate()
            }
            break
        case 'field':
            if (currentQty > 0) {
                window.setTimeout('calculate()', 500)
            }
            break
    }
}
function calculate(){
	var currentQty = parseInt($F('quant')) // Where quant is the id of your quantity input field. Gets value of currentQty field    
	var jsnormalprice = $F('jsnormalprice') // Where jsnormalprice is the id of your hidden base price field. Gets value of base_price field	
	var jsspecialprice = $F('jsspecialprice') // Where  is the id of your hidden base price field. Gets value of base_price field	

	if (currentQty > 0) { // Don't want price to display if zero if customer zeros out quantity
        var new_jsnormalprice = jsnormalprice * currentQty // Calculate the price.		
        var new_jsnormalprice = new_jsnormalprice.toFixed(2) // Only allow 2 decimals. I'll let you add rounding features up or down.
		
        var new_jsspecialprice = jsspecialprice * currentQty // Calculate the price.		
        var new_jsspecialprice = new_jsspecialprice.toFixed(2) // Only allow 2 decimals. I'll let you add rounding features up or down.
    
	} else { // set price back to original price
        new_jsnormalprice = jsnormalprice
        new_jsspecialprice = jsspecialprice
    }	
	
    $('jsnormalpriceshow').update(new_jsnormalprice) // Where jsnormalpriceshow is the id of your span for the echoed product price
    $('jsspecialpriceshow').update(new_jsspecialprice) // Where jsspecialpriceshow is the id of your span for the echoed product price

}