Whoops, when Dentful1 corrected his the source code went away making it unsuitable for sjclimber to copy. Here is my source code with '***' added to make it show up.
To make this work the *** has to be removed in three places. To use the default text (Let's Go Geocaching), take out everything between the 2nd and 3rd ***s also. To display a different message, place it between txt= and &. For example: txt=My+Message& No spaces and separate words with a + sign.
Be sure to use your own uid.
Have a nice day.