using image as delete option

[mia]

hi all..


i have the following line in jsp ( actually this is a for each loop
value will be different for differnt row )

										<td width="10%" align="center" class="tr4">
											<INPUT type="image" src="images/button_Delete.gif" name="delete" value="<core&#58;out value="$&#123;purchaseOrderLineItemList.materialId&#125;"/>">
										</td>

i am checking if it was clicked as below

if (request.getParameter("delete.x")!= null){....}

i need to know how to get the value of that button ..

or how to detect that id ?
Thanx