function formchecker_comments(){

if (document.comment.firstName.value=="")

{alert("Please enter your first name.")
return false
}

if (document.comment.familyName.value=="")
{
alert("Please enter your family name.")
return false
}

if (document.comment.email.value=="")
{
alert("Please enter your e-mail.")
return false
}

if ((document.comment.email.value.indexOf("@") == -1) || (document.comment.email.value.indexOf(".") == -1))
{
alert("Incorrect form of e-mail address.")
return false
}

if (document.comment.comment.value=="")
{
alert("Please enter your comment.")
return false
}

return true
}