More thumbnail size

Hi,
I'm currently working on a product page. And I want to show images of my product in another size than the one I defined in my configuration.

I have done this chunk of code, but I don't think it was the best way to do that :

$image = hikashop::get('helper.image');
$size = getimagesize($image->uploadFolder.$p->images[0]->file_path);
$image->width = $size[0];
$image->height = $size[1];
$image->_resizeImage($p->images[0]->file_path,$resize,$resize/$size[0]*$size[1],$dstFolder,"image");

I don't want to use a CSS solution for obvious image weight problems.
Some page will contains a lot of these images and I don't want to have longer loading than needed for my users.

I want to generate a new image file and not resize on the client side one existing.
My code here seems to do that but it seems to generates images files everytime it loads and seems kind of "hacky".
I can check the existance of an image to generate it or not but it would have been better to have a function in the helper that does that. If it's not currently possible, I ask it as a new feature.

Thanks.

Hope this gest done soon. Really need it