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(email,"Email must be filled out!")==false)
			{email.focus();return false;}
		if (validate_email(email,"Not a valid e-mail address!")==false)
			{email.focus();return false;}
		return true;		
	}
}