jCarousel variable image widths in carousel

Hi All,
I've been setting up a gallery for a friend using jCarousel and have a question about image widths. At the moment the carousel is showing images in both landscape and portrait format (imagine photographs in their natural format without any cropping). These images have an absolute height set, but being both landscape and portrait are naturally different widths.

It seems that when loading the page with the carousel I'm left with missing pictures, however if I reload the page all the images appear and the carousel begins to work fine. My question is:

Is there any way to get the JCarousel to work on the first load, rather than having to reload the page to get the whole gallery of images?

A little about the setup: I'm using Views to pull in images to a block for jCarousel to display, with a link to a colourbox overlay for a larger version of each image.

Any help with this will be greatly appreciated.

Regards,
Phil