function checkform()
{
var filter = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;

	if (document.myform.name.value == "")
	{
		// something is wrong
		alert('You must include your name.');
		document.myform.name.focus();
		return false;
	}
	else if (!filter.test(document.myform.email.value))
	{
		// something else is wrong
		alert('You must include a valid e-mail address.');
		document.myform.email.focus();
		return false;
	}
	
	else if (document.myform.comments.value == "")
	{
		// something else is wrong
		alert('You must include some comments.');
		document.myform.comments.focus();
		return false;
	}
	
	return true;
}