Internet Explorer

Step 1: Open the Internet Options Dialog Box

Open an Internet Explorer browser window and select Internet Options from the Tools menu.

Step 2: Select the Security Tab

Click on the Security tab.

Step 3: Select the Trusted Sites Zone

Internet Explorer provides four different zones for which you can set different Security settings. To add a site to the Trusted sites zone, click on Trusted sites

Step 4: Set the Security Level for the Zone to Low

Click on the Default Level button and move the slider to Low.

Step 5: Add Sites to the Trusted Zone

Click on the Sites... button to add sites to the trusted zone.

Un-tick "Requires server verification (https:) for all sites in this zone" if Merco is not running over HTTPS.
Type the address of the site you wish to add to the Trusted site zone in the textbox and click Add.
Continue adding the sites you trust. When you are finished, click Ok

Click Ok to close the Internet Options dialog box.