function checkComments() {
//alert ("checkComments 1");
	var comments = document.getElementById("comments").value;
	if (isEmpty(comments)) {
		document.getElementById("comments").className="invalid";
		document.getElementById("comments_err").className="err";
		document.getElementById("comments_err").value =err_comments;
		commentsValid = false;
		return false;
	}

// alert ("comments "+comments);
	if (isComment(comments)) {
//alert ("checkComments 2");
		document.getElementById("comments").className="valid";
		document.getElementById("comments_err").className="no-err";
		document.getElementById("comments_err").value ="";
		commentsValid = true;
		return true;
	} else {
//alert ("checkComments 3");
		document.getElementById("comments").className="invalid";
		document.getElementById("comments_err").className="err";
		document.getElementById("comments_err").value =err_comments;
		commentsValid = false;
	}
}