Help with flickering buttons (renamed)

If you click on the Map Options tab and turn City Markers to “on”, when you roll over them they flicker. Why?? They have a RollOver command that turns the textbox visibility to true and RollOut command that turns it to false. They are not in a loop anywhere?? I’m lost. Thanks A lot Guys!!!

Here’s the link to see it, the file size was large to upload!!
[URL=“http://jonah.kingsu.ca/~crystal/projects/gcc/Temp_change.html”]
http://jonah.kingsu.ca/~crystal/projects/gcc/Temp_change.html