and what code should i use to show the image on the product.tpl? This i have bellow? I am not familiar..
my extra field service name is "ship_by_mail"
{if $extra_fields[field].ship_by_mail eq "Y"}
<img src="/skin1/images/myimage.gif" />{/if}
or
{if $extra_field.service_name eq "ship_by_mail"}
{if $extra_field.value eq "Y"}
<img src="skin1/images/custom/ship_by_mail.gif" />{/if}{/if}
none of those workings