function changeQty(change){var currentQty=parseInt($F('quant'))
switch(change){case'add':currentQty+=1
$('quant').value=currentQty
calculate()
break
case'subtract':if(currentQty>1){currentQty-=1
$('quant').value=currentQty
calculate()}
break
case'field':if(currentQty>0){window.setTimeout('calculate()',500)}
break}}
function calculate(){var currentQty=parseInt($F('quant'))
var jsnormalprice=$F('jsnormalprice')
var jsspecialprice=$F('jsspecialprice')
if(currentQty>0){var new_jsnormalprice=jsnormalprice*currentQty
var new_jsnormalprice=new_jsnormalprice.toFixed(2)
var new_jsspecialprice=jsspecialprice*currentQty
var new_jsspecialprice=new_jsspecialprice.toFixed(2)}else{new_jsnormalprice=jsnormalprice
new_jsspecialprice=jsspecialprice}
$('jsnormalpriceshow').update(new_jsnormalprice)
$('jsspecialpriceshow').update(new_jsspecialprice)}