if i view source of your page, for the last item, the add to cart code looks like this:
<td rowspan="4" valign="bottom"><input name="eCart1_8_Quantity_Add" type="text" value="1" size="3" maxlength="3" />
<input type="hidden" name="eCart1_8_ID_Add" value="300_006" />
<br />
<br />
<form name="eCart1_8_ATC_300_006" method="POST" action="/equip.php">
<input type="image" src="images/atc.jpg" border="0" class="eC_ImageButton" value="Add to Cart" name="eCart1_8_ATC">
</form></td>
the problem is that the quatity text field and the ID hidden element are not inside the form tags. the form tags:
<form name="eCart1_8_ATC_300_006" method="POST" action="/equip.php">
<input type="image" src="images/atc.jpg" border="0" class="eC_ImageButton" value="Add to Cart" name="eCart1_8_ATC">
</form>
only include the submit button. since the quantity and ID elements are outside the form tag, they are not submitted when the submit burton is pressed.
the add to cart code should have the quantity and id elements inside the form tag:
<td rowspan="4" valign="bottom"><form name="eCart1_8_ATC_300_006" method="POST" action="/equip.php"><input name="eCart1_8_Quantity_Add" type="text" value="1" size="3" maxlength="3" />
<input type="hidden" name="eCart1_8_ID_Add" value="300_006" />
<br />
<br />
<input type="image" src="images/atc.jpg" border="0" class="eC_ImageButton" value="Add to Cart" name="eCart1_8_ATC">
</form></td>