function isValid() {

	var nName=document.addcomment.nName.value;
	var nEmail=document.addcomment.nEmail.value;
	var nComment=document.addcomment.nComment.value;

if (1>nName.length || 'Name' == nName)
	{alert ('You did not fill in Name field. Please check and correct it.')
	return false;}
if (1>nComment.length)
	{alert ('You did not fill in Comment field. Please check and correct it.')
	return false;}
if(nEmail.length != 0) {
	if (1>nEmail.indexOf('@') || 1>nEmail.indexOf('.'))
	{alert ('Invalid EMAIL address! Please check and correct it.')
	return false;}
}

else {return true;}

}