function ValidateGradYear()
{
  var gradYearError = document.getElementById('spGradYearError');
  var gradYear = parseInt(document.getElementById('tbGradYear').value, 10);
  var isValid = (!isNaN(gradYear) && gradYear >= 1907 && gradYear <= 2007);
   
  if( isValid )
    gradYearError.style.display = 'none';
  else
    gradYearError.style.display = 'inline';
    
  return isValid;
}


function find_centennial_rep_init()
{
  document.getElementById('btSubmit').onclick = ValidateGradYear;
}

if( window.onload )
{
	document.oldOnLoad = window.onload;
	window.onload = function()
	{
		oldOnLoad();
		find_centennial_rep_init();
	}
}
else
	window.onload = find_centennial_rep_init;