Magda, You’re probably referring to the Hunab Ku, right?
A mayan priest from Ecuador told me that it is exactly the same thing as the Tai Chi symbol. I can’t help you get the picture up here except to say that you ought to be able to “insert image” from the bottom of this posting page. -AA
You can only use the link below to link to a photo that is already uploaded to an internet site and has a web address. I did a google search for the hunab ku that AA mentioned, and found one at this address: http://www.diagnosis2012.co.uk/hunab.jpg
I then put that address into the “insert image” box and, voila, it should be below!
If you have a personal image you want to upload, you need to have your own website or be a member of some website (such as flickr or taobums.com) that allows some photos to be uploaded.