X-Cart forums - variable for order total

I am trying to set up my google conversion analytics and supposedly I can use this

Code:

<!-- Google Code for Placed Order Conversion Page -->

<script type="text/javascript">

<!--

var google_conversion_id = xxxxxxxxxx;

var google_conversion_language = "en_US";

var google_conversion_format = "3";

var google_conversion_color = "ffffff";

var google_conversion_label = "Xxxxxxxxxx";

var google_conversion_value = 0;

if (<? echo $order.total ?>) {

  google_conversion_value =<? echo $order.total ?>;

}

//-->

</script>

<script type="text/javascript" src="https://www.googleadservices.com/pagead/conversion.js">

</script>

<noscript>

...

I have 2 questions, 1. is $order.total the correct variable for the order total on the thank you page, and for the line

Code:

google_conversion_value =<? echo $order.total ?>;

should there be a ; or no ;? The code snippet on googles page had it without the ; but it wasn't working so I added it. (still doesn't work) but i'm not sure if it is because my variable is wrong or the ;.
Anyone know?
Thanks.