function isNumeric(sText){
  var ValidChars = "0123456789";
  var IsNumber=true;
  var Char;

  for (i = 0; i < sText.length && IsNumber == true; i++){
    Char = sText.charAt(i);
    if (ValidChars.indexOf(Char) == -1){
      IsNumber = false;
    }
  }
  return IsNumber;
}

function isEmpty(strng) {
  if (strng == null || strng == "") {
    return true;
  }
  for (i=0;i<strng.length;i++) {
    if (strng.charAt(i) != ' ') {
      return false;
    }
  }
  return true;
}

function check_form(o) {
	var errStr = '';

	if(isEmpty(o.fname.value))
	{
		errStr += '- Please enter your first name.\n';
	}
	if(isEmpty(o.lname.value))
	{
		errStr += '- Please enter your last name.\n';
	}
	if(isEmpty(o.email.value))
	{
		errStr += '- Please enter your e-mail address.\n';
	}

	if(errStr=='')
	{
		return true;
	}
	else
	{
		alert(errStr);
		return false;
	}
}