// JavaScript Document
function calculateVolume()
{
var total_volume = 0;
var i;
var totalmeubels = document.getElementById('totalmeubels').value;
for ( i = 0; i < totalmeubels; i++ )
{
var volume = document.getElementById('volume'+i).value;
var aantal = document.getElementById('aantal'+i).value;
total_volume = total_volume + (volume * aantal);
}
total_volume = ( Math.round(total_volume * 10) ) / 10;
document.getElementById('volume_total').value = total_volume;
document.getElementById('volume_total2').value = total_volume;
document.getElementById('volume_total3').value = total_volume;

return total_volume;
}