For my Russia-Georgia War maps I had a fixed non-movable legend in the bottom left corner of the screen. I preferred the legend because it provided a solid reminder of what date was being shown and it promoted the blog.
I have received several requests for the code to create the legend so below is the code.
First, create a legend in an image editing software and save as an image file like .jpg, .bmp, or .gif. Second, open Notepad. Then type/copy in the code below into Notepad.
<ScreenOverlay id="legend"><name>Give the file a display name</name><description>Write what you want displayed in the properties textbox</description><Icon><href>Write the path to the legend image</href></icon><overlayXY x="0" y=".055" xunits="fraction" yunits="fraction"/><screenXY x="0" y=".055" xunits="fraction" yunits="fraction"/><rotation>0</rotation><size x="0" y="0" xunits="pixels" yunits="pixels"/></ScreenOverlay>