var errfound = false;
function ValidLength(item, len) {
   return (item.length >= len);
}
function trim(s) {
  while ((s.substring(0,1) == ' ') || (s.substring(0,1) == '\n') || (s.substring(0,1) == '\r'))  {
    s = s.substring(1,s.length);
  }
  while ((s.substring(s.length-1,s.length) == ' ') || (s.substring(s.length-1,s.length) == '\n') || (s.substring(s.length-1,s.length) == '\r'))  {
    s = s.substring(0,s.length-1);
  }
  return s;
}
function error(elem, text) {
   if (errfound) return;
   window.alert(text);
   if(elem.type == 'text') elem.select();
   elem.focus();
   errfound = true;
}

function Validate_search(form) {
    errfound = false;
    if (!ValidLength(form.searchtext.value,2) || form.searchtext.value == "" ) {
        error(form.searchtext,"Hledaný výraz musí mít alespoň 2 znaky!");
    }
    return !errfound;
}