The source like this:

<script language="javascript" type="text/javascript">
<!--
		
pocetpobocek--;
		
//-->
</script>

------------------------------
Returns those errors
------------------------------


Validation Output:  2 Errors

   1. Error Line 161, Column 16: invalid comment declaration: found character ";" outside comment but inside comment declaration.

      		pocetpobocek--;

      &#9993;

      Check that you are using a proper syntax for your comments, e.g: <!-- comment here -->. This error may appear if you forget the last "--" to close one comment, and later open another.
   2. Info Line 159, Column 2: comment declaration started here.

      		<!--

   3. Error Line 161, Column 14: XML Parsing Error: Comment not terminated .

      		pocetpobocek--;