Change the HEX-code of the color Tag. The order is:[transparency blue green red]
The range of values for any one color is 0 to 255 (00 to ff). For alpha, 00 is fully transparent
and ff is fully opaque.
blue markers: #ffff0000 red markers: #ff0000ff yellow markers: #ff00ffff dark pink markers: #ffff55ff orange markers: #ff0099ff grey markers: #ff999999
Save the text file with extension .kml
Open that file in GoogleEarth
Right-click on your newly created ow database in the placemark-browser
Select Save as...
Save it as a .kmz-file for it is smaller and the icon in inlcuded in the file