function validateForm(form)
{	
  with(form)
  {
	if(username.value == "" 
	|| username.value.length < 3
	|| username.value.length > 20)
	{
		alert("Username must be between 3 and 20 characters.");
		return false;
	}		
	else if(password.value == ""
	|| password.value.length < 6
	|| password.value.length > 20)
	{
		alert("Password must be between 6 and 20 characters.");
		return false;
	}
	else if(password.value != password2.value)
	{
		alert("Passwords do not match.");
		return false;
	}
	else if(email.value == "" 
	|| email.value.indexOf("@") < 1 
	|| email.value.indexOf(".") == -1 
	|| email.value.length < 5)
	{
		alert("Email must be a valid address.");
		return false;
	}
	else return true;
  }
}