function validate_required(field,alerttxt)

{

	with (field)

	{

	  if (value==null||value=="")

	  {

	  	alert(alerttxt);

	  	return false;

	  }

	  else

	  {

	  	return true;

	  }

	}

}



function validate_email(field,alerttxt)

{

	with (field)

	{

		apos=value.indexOf("@");

		dotpos=value.lastIndexOf(".");

		if (apos<1||dotpos-apos<2)

		{

			alert(alerttxt);

			return false;

		}

		else

		{

			return true;

		}

	}

}



function validate_form(thisform)

{

	with (thisform)

	{

		if (validate_required(fname,"Please tell us your first name.")==false)

		{

			fname.focus();

			return false;

		}



		if (validate_required(email,"Please tell us your email address.")==false)

		{

			email.focus();

			return false;

		}



		if (validate_email(email,"Please enter a valid email address.")==false)

		{

			email.focus();

			return false;

		}

	}

}