function Trim(s) 
{
  // Remove leading spaces and carriage returns
  
  while ((s.substring(0,1) == ' ') || (s.substring(0,1) == '\n') || (s.substring(0,1) == '\r'))
  {
    s = s.substring(1,s.length);
  }

  // Remove trailing spaces and carriage returns

  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 lastcheck()
{
last=((Trim(document.forms['bForm'].elements['knr'].value)!='')||
      (Trim(document.forms['bForm'].elements['blz'].value)!=''));

if((document.forms['bForm'].elements['optr'].checked)||
(document.forms['bForm'].elements['optl'].checked)||last)
  {
   document.forms['bForm'].elements['optl'].checked=last;
   document.forms['bForm'].elements['optr'].checked=!last;
  }
}