function showorhide( val ) {
    var obj = document.getElementById( val ) ;
    if ( obj.style.display == "block" ) {
        obj.style.display = "none" ;
    } else {
        obj.style.display = "block" ;
    }    
}

function show( item ) {
    var obj = document.getElementById( item );
    var lnk = document.getElementById( 'a_' + item );
    obj.style.display = 'block';
//    lnk.className = 'close';
//    lnk.innerHTML = 'bezár';
    lnk.href = 'javascript:hide("' + item + '");';
    window.focus() ;
}

function hide( item ) {
    var obj = document.getElementById( item );
    var lnk = document.getElementById( 'a_' + item );
    obj.style.display = "none";
//    lnk.className = 'expand';
//    lnk.innerHTML = 'megnyit';
    lnk.href = 'javascript:show("' + item + '");';
    window.focus() ;
}

// calculate the ASCII code of the given character
function CalcKeyCode(aChar) {
  var character = aChar.substring(0,1);
  var code = aChar.charCodeAt(0);
  return code;
}

function checkNumber(val) {
  var strPass = val.value;
  var strLength = strPass.length;
  var lchar = val.value.charAt((strLength) - 1);
  var cCode = CalcKeyCode(lchar);

  /* Check if the keyed in character is a number
     do you want alphabetic UPPERCASE only ?
     or lower case only just check their respective
     codes and replace the 48 and 57 */

  if (cCode < 48 || cCode > 57 ) {
    var myNumber = val.value.substring(0, (strLength) - 1);
    val.value = myNumber;
  }
  return false;
}