function validateForm(f)
{

if(""==document.forms.f.comments.value)
{
alert("Please provide us with some comments about the product");
document.forms.f.comments.focus();
return false;
}

/*if(""==document.forms.f.rating.value)
{
alert("Please provide a Star rating");
return false;
}*/

if(""==document.forms.f.username.value)
{
alert("Please enter a display name");
document.forms.f.username.focus();
return false;
}

}