THIS GOES IN THE "CHILDREN"
<form name="children" method="post" action={'content/action'|ezurl}>
<input type="hidden" name="ContentNodeID" value="{$node.node_id}" />

THIS GOES IN THE LISTING TEMPLATE
<input type="checkbox" name="DeleteIDArray[]" value="{$Nodes.item.node_id}" title="{'Use these checkboxes to select items for removal. Click the "Remove selected" button to actually remove the selected items.'|i18n( 'design/admin/node/view/full' )|wash()}" />

THIS GOES IN THE "CHILDREN"
{* Remove button *}
    <input class="button" type="submit" name="RemoveButton" value="{'Remove selected'|i18n( 'design/admin/node/view/full' )}" title="{'Remove the selected items from the list above.'|i18n( 'design/admin/node/view/full' )}" />

</form>