How to put images in mail_header.tpl

[hel68c +]

Hi,

I am trying to place an image in the template mail_header.tpl, and nothing appears.

<table id="Masthead" cellspacing="0" cellpadding="5" width="100%" bgcolor="#547fdc" background="{$smarty.const.URL}/images/PIC13_TRAIN1_HEAD.jpg">
<tr>
<td style="vertical-align:middle;">
<div style=" float:left; padding: 3px 0px 3px 3px; margin: 0px; line-height: 36px; border:0px;"><img src="http://hobbyclassified.com/images/logo_point_com_shade_225.png" alt="Hobby Classified"/> </div>

</td>
</tr>
</table>

I tried those manner:

{$smarty.const.URL}/images/PIC13_TRAIN1_HEAD.jpg}
http://hobbyclassified.com/images/PIC13_TRAIN1_HEAD.jpg

is someone know how to?