function validateForm(contactForm)
{

if(""==document.forms.contactForm.name.value)
{
alert("Please fill in your name.");
return false;
}

if(""==document.forms.contactForm.email.value)
{
alert("Please fill in your email address.");
return false;
}

if(""==document.forms.contactForm.comments.value)
{
alert("Please fill in the comments.");
return false;
}
}