remember to hit refresh refresh refresh. it looks shrunk on my side too.
its customer/home.tpl for sure. do doubts about that.
i think ur hardcoding ur images with full path.
replace ur image link with this
<A href="help.php?section=contactus&mode=update"><IMG src="{$ImagesDir}/customer_images/contact_us.jpg" width="138" height="147" border="0"></A>
and upload contac us jpg to the customer_images folder
you also have some breaks in the code there above and below the image.
the whole td should be like this
<TD><A href="help.php?section=contactus&mode=update"><IMG src="{$ImagesDir}/customer_images/contact_us.jpg" width="138" height="147" border="0"></A></TD>