function checkfields(form){
   if(form.comment.value == ''){
	   alert("You didn't enter a comment");
	   form.comment.focus();
	   return false;
	}
	if(form.author.value == ''){
	   alert("Please enter your name");
	   form.author.focus();
	   return false;
	}
	if(form.captcha.value == ''){
	    alert("Please enter the Security Code")
	    return false;
	}
	return true;
}