Pay with Credit Balance

[Nyan]

I customized Order Form Template in reference to the following.

http://forum.whmcs.com/showthread.php?31405-Pay-with-Credit-Balance

Template: Six
Order Form Template: Standard Cart

<div class="total-due-today total-due-today-padded">
<span class="amt">{$total}</span>
<span>{$LANG.ordertotalduetoday}</span>
</div>

Change the above code to the following.

{if $clientsdetails.credit > 0}
{assign var="inttotal" value=$total|replace:$currency.suffix:''}
{assign var="inttotal" value=$inttotal|replace:$currency.prefix:''}
<div class="recurring-totals clearfix">
<span class="pull-left">{$LANG.statscreditbalance}:  </span>
<span class="pull-right recurring-charges">{$clientsstats.creditbalance}</span>
</div>
{if $clientsdetails.credit > $inttotal}
<div class="total-due-today total-due-today-padded">
<span class="amt">0</span>
<span>{$LANG.ordertotalduetoday}</span>
</div>
{else}
{assign var="total" value=$inttotal-$clientsdetails.credit}
{assign var="total" value=$total|number_format:0}
<div class="total-due-today total-due-today-padded">
<span class="amt">{$total}</span>
<span>{$LANG.ordertotalduetoday}</span>
</div>
{/if}
{else}
<div class="total-due-today total-due-today-padded">
<span class="amt">{$total}</span>
<span>{$LANG.ordertotalduetoday}</span>
</div>
{/if}

It is calculated correctly if the following settings.
Setup > Payments > Currencies > Format:1234.56

However if the following settings, it is not calculated correctly.
Setup > Payments > Currencies > Format:1,234
or
Setup > Payments > Currencies > Format:1,234.56

Please tell me how to resolve.