I have a webpage with a shoping cart, i have installed the ssl to my site with https, but lately, i've been getting complaints from customers and visitors telling me that they are getting a popup window that says:

QUOTE:
This Page contains both secure and nonsecure items
do you want to display the nonsecure items?


I've look at my code, and it all appears to be ok. is it something to do with their computer? Is this a user issue?

Any Help you can provide will be helpful