安全警告Paypal

When leaving Paypal standard to return to my WP site I get the warning message -

“Although this page is encrypted, the information you have entered is to be sent over an unencrypted connection and could easily be read by a third party. Are you sure you want to continue sending this information?” What can be done to prevent this message?

Put your page into https. Error is given because a script from an unsecured vendor is requesting data from a secured vendor. It is perfectly harmless in most situations, however an annoying 'feature' in internet explorer.