function validateForm(commentform) {
var valid = true ;
if (commentform.author.value == "" | commentform.author.value == "Please enter your name" ) {
valid = false ;
commentform.author.value = "Please enter your name" ;
}
if (commentform.email.value == "" | commentform.email.value == "Please enter your email address") {
valid = false ;
commentform.email.value = "Please enter your email address" ;
}
if (commentform.comment.value == "" | commentform.comment.value == "Please enter your comment") {
valid = false ;
commentform.comment.value = "Please enter your comment" ;
}
return valid ;
}