Pop Up "Enlarge Image" Auto Resizable?

[Guest]

Hi everyone.

 

When someone goes to a product page on my site and clicks "Click To Enlarge" on the image, it pops up a new window and shows my product in a bigger image (as it should).

 

The issue I'm having is some of my pictures are too big for some people's screen size and will run off the edges. Then when they resize the pop up window, the image simply runs out the corner of the window and is cut off.

 

Anyone know of any way that I can make it so the pop up window comes up to match someone's screen size and the image inside it will be auto sized to match the size of the window?

 

Thanks

 

Here's an example:

http://jenenichelle.com/jn220-p-106.html