losing the header frame when ad is being placed

[paultime]

WE FIGURED OUT AN ACCEPTABLE FIX FOR THIS- NO FURTHER HELP NEEDED- THANKS TO ANYONE WHO READ IT & TRIED TO FIGURE OUT A SOLUTION!!! We are using frames on our site, with Classified pages appearing in our main frame below the header & navigation frame. When placing an ad, steps 1,2,3,4 appear in the main frame (with our name + navigation links in frame above). After going to step 5, the page loses our header. The file usercheckout.php seems to be losing the target frame info., & defaults to the Whole Page Target frame. From then on visitors lose all reference to our site- except the URL address, and they can't navigate back on our site.
If anyone would like to see it in action: Office Furniture Association,
click classifieds on top blue bar, login with user: guest1, password: guest2, click place an ad,step 1-continue,step 2 click any package, step 3 enter anything in the fields,then continue, step 4- click skip this step. You will see what happens. - We are beginner level at coding, and if anyone has a solution,
it would be much appreciated. But please dumb down any suggestions. THANKS IN ADVANCE! Paul