var emptyString = /^\s*$/ ;
var global_valfield;

function trim(str)
{
  return str.replace(/^\s+|\s+$/g, '');
}

function setFocusDelayed()
{
  global_valfield.focus();
}

function setfocus(valfield)
{
  global_valfield = valfield;
  setTimeout( 'setFocusDelayed()', 100 );
}

function field_error(fld,cssclass)
{
  var elem = document.getElementById(fld);
  elem.className = cssclass;
}

var proceed = 2;  

function commonCheck    (valfield,infofield,required)
{
  if (!document.getElementById) 
    return true;
  var elem = document.getElementById(infofield);

  if (emptyString.test(valfield.value)) {
    if (required) {
      field_error (infofield, "error");  
      setfocus(valfield);
      return false;
    }
    else {
      field_error (infofield, "textfield");
      return true;  
    }
  }
  return proceed;
}

function validateName(valfield,infofield,required)
{
  var stat = commonCheck (valfield, infofield, required);
  if (stat != proceed) return stat;

  field_error (infofield, "textfield");  
  return true;
}

function validateEmail  (valfield,infofield,required)
{

  var stat = commonCheck (valfield, infofield, required);
  if (stat != proceed) return stat;

  var tfld = trim(valfield.value);
  var email = /^[^@]+@[^@.]+\.[^@]*\w\w$/  ;
  if (!email.test(tfld)) {
    field_error (infofield, "error");
    setfocus(valfield);
    return false;
  }

  var email2 = /^[A-Za-z][\w.-]+@\w[\w.-]+\.[\w.-]*[A-Za-z][A-Za-z]$/  ;
  if (!email2.test(tfld)) 
    field_error (infofield, "error");
  else
    field_error (infofield, "textfield");
  return true;
}

function validatePhone  (valfield,infofield,required)
{
  var stat = commonCheck (valfield, infofield, required);
  if (stat != proceed) return stat;

  var tfld = trim(valfield.value);
  var telnr = /^\+?[0-9 ()-]+[0-9]$/  ;
  if (!telnr.test(tfld)) {
    field_error (infofield, "error");
    setfocus(valfield);
    return false;
  }

  var numdigits = 0;
  for (var j=0; j<tfld.length; j++)
    if (tfld.charAt(j)>='0' && tfld.charAt(j)<='9') numdigits++;

  if ((numdigits>14) || (numdigits<10))
    field_error (infofield, "error");
  else { 
      field_error (infofield, "textfield");
  }
  return true;
}

function validateComments  (valfield,infofield,required)
{
	if(required)
	{
		if(valfield.value=='')
		{
		  field_error (infofield, "comment_box_error");
		  return false; 
		}
		else
		{
		  field_error (infofield, "comment_box");
		  return true;  
		}
	}
	else
	{
	  field_error (infofield, "comment_box");
      return true;  
	}
}

function validateYear  (valfield,infofield,required)
{
  var stat = commonCheck (valfield, infofield, required);
  if (stat != proceed) return stat;

  var tfld = trim(valfield.value);
  var telnr = /^[0-9]+[0-9]$/  ;
  if (!telnr.test(tfld)) {
    field_error (infofield, "error");
    setfocus(valfield);
    return false;
  }

  var numdigits = 0;
  for (var j=0; j<tfld.length; j++)
    if (tfld.charAt(j)>='0' && tfld.charAt(j)<='9') numdigits++;

 if ((numdigits>4) || (numdigits<4))
    field_error (infofield, "error");
  else { 
      field_error (infofield, "textfield");
  }
  return true;
}

function validateNumber  (valfield,infofield,required)
{
  var stat = commonCheck (valfield, infofield, required);
  if (stat != proceed) return stat;

  var tfld = trim(valfield.value);
  var telnr = /^[0-9]+[0-9]$/  ;
  if (!telnr.test(tfld)) {
    field_error (infofield, "error");
    setfocus(valfield);
    return false;
  }
  return true;
}