Icons missing in Portal

I need to display red , yellow & green LEDs in Portal Screen . So i have writtem following HTML Code

<htmlb:groupBody>

<table>

<tr valign="middle">

<td>

<htmlb:image src="@S_LEDR@" />

</td><td>

<htmlb:textView text="<%= ivw_model->counter_red %>" />

</td>

<td>&nbsp;&nbsp;</td>

<td>

<htmlb:image src="@S_LEDY@" />

</td><td>

<htmlb:textView text="<%= ivw_model->counter_yellow %>" />

</td>

<td>&nbsp;&nbsp;</td>

<td>

<htmlb:image src="@S_LEDG@" />

</td><td>

<htmlb:textView text="<%= ivw_model->counter_green %>" />

</td>

</tr>

</table>

</htmlb:groupBody>

This code is working fine in 4.6c version ,we copied the same code to ECC 6.0 ,everything is working fine,except these icons went missing. Can anyone please guide me ,why these icons are not displaying in ECC version?