need help with this Conversion tracking code from Google. Can anyone comment is this correct variable if I would like to track total ammount of purchase. (Total_Cost) I'm total new to JS.
Thanks so much !

<!-- Google Code for purchase Conversion Page -->
<script language="JavaScript" type="text/javascript">
var google_conversion_id = 1062699999;
var google_conversion_language = "en_US";
var google_conversion_format = "1";
var google_conversion_color = "FFFFFF";
if (Total_Cost) {
var google_conversion_value = Total_Cost;
var google_conversion_label = "purchase";
<script language="JavaScript" src="https://www.googleadservices.com/pagead/conversion.js">
<img height=1 width=1 border=0 src="https://www.googleadservices.com/pagead/conversion/1062699999/?value=Total_Cost&label=purchase&script=0">