[SOLVED] Want to use the "Back" button and not return to the index

Template #9- In our site http://www.templebaptistmarshfield.org/, which is a church website, we have a Missions page (_missions.htm) that is accessed by a link within the Ministries page (that has a "Ministries" button.)

How can the user stay on the Missions "page" when they are accessing links on and within the Missions page, use the "back" button in either IE or Firefox, and stay in on the Missions page and not be taken all the way back to the index (Main page).

In short, would like to use the "back" button and go back one "page" but not all the way back to the index. Thank you in advance for any assistance.