function isNumeric(sText)
{
   var ValidChars = "-0123456789.,";
   var IsNumber=true;
   var Char;

 
   for (i = 0; i < sText.length && IsNumber == true; i++) 
      { 
      Char = sText.charAt(i); 
      if (ValidChars.indexOf(Char) == -1) 
         {
         IsNumber = false;
         }
      }
   return IsNumber;
   
   }

function showHide(warstwa)
{
	if (document.getElementById(warstwa).style.display == 'none') visibleornot = 'block';
	else visibleornot = 'none'

	document.getElementById(warstwa).style.display = visibleornot;
   
   }