Position problem with hover

Hi,
I have a problem with menu image.
All my images are in wrong position with hover effect.
I took a look at the code and I have a question :
In function menu_image_nav_menu_item_title_filter (ligne 508 in menu-image.php)
There is those lines :

if ( $item->thumbnail_hover_id ) {
$this->setUsedAttachments( $image_size, $item->thumbnail_hover_id );
$hover_image_src = wp_get_attachment_image_src( $item->thumbnail_hover_id, $image_size );
$margin_size = $hover_image_src[1];
$image = “<span class=’menu-image-hover-wrapper’>”;
$image .= wp_get_attachment_image( $item->thumbnail_id, $image_size, false, “class=menu-image {$class}” );
$image .= wp_get_attachment_image(
$item->thumbnail_hover_id, $image_size, false, array(
‘class’ => “hovered-image {$class}”,
‘style’ => “margin-left: -{$margin_size}px;”,
)
);
$image .= ‘</span>’;
}

So, the margin_size is equal to the hover image size.
This not working when I put only an image (with hover) without text because the margin-left is (- *image size*)px.
I have made a little modifcation to resolve the problem in my case :

if ( $item->thumbnail_hover_id ) {
$this->setUsedAttachments( $image_size, $item->thumbnail_hover_id );
$hover_image_src = wp_get_attachment_image_src( $item->thumbnail_hover_id, $image_size );
$margin_size = ($hover_image_src[1])/2 + ($hover_image_src[1])*0.033;
$image = “<span class=’menu-image-hover-wrapper’>”;
$image .= wp_get_attachment_image( $item->thumbnail_id, $image_size, false, “class=menu-image {$class}” );
$image .= wp_get_attachment_image(
$item->thumbnail_hover_id, $image_size, false, array(
‘class’ => “hovered-image {$class}”,
‘style’ => “margin-left: -{$margin_size}px;”,
)
);
$image .= ‘</span>’;
}

It works perfectly but I have to make this modification frequently…
Is there any way to put the modification in functin.php ?

Thanks a lot

Cédric ( sorry for my english, I’m french)