[*] FO oosHook must be a div, not a paragraph

for code validation, oosHook must be a div, not a paragraph.

themes/default/product.tpl

@@ -352,9 +352,9 @@ var fieldRequired = '{l s='Please fill in all the required fields before saving
 			{/if}
 
 			<!-- Out of stock hook -->
-			<p id="oosHook"{if $product->quantity > 0} style="display: none;"{/if}>
+			<div id="oosHook"{if $product->quantity > 0} style="display: none;"{/if}>
 				{$HOOK_PRODUCT_OOS}
-			</p>
+			</div>
 
 			<p class="warning_inline" id="last_quantities"{if ($product->quantity > $last_qties OR $product->quantity <= 0) OR $allow_oosp OR !$product->available_for_order OR $PS_CATALOG_MODE} style="display: none"{/if} >{l s='Warning: Last items in stock!'}</p>
 		</div>