function validate_comment(form)
{
    var re = /^\s*$/;
    for(var i=0; i < form.elements.length; i++)
    {
        var val = form.elements[i].value;
        if(form.elements[i].name == 'alert')
            continue;
        if(val == "" || val.match(re) )
        {
            var nice_name = form.elements[i].name;
            if(nice_name == 'from')
            {
                nice_name = 'Name field';
            }
            else if(nice_name == 'comment')
            {
                nice_name = 'Comment field';
            }
            else if(nice_name == 'email')
            {
                nice_name = 'Email address';
            }
            alert("Please enter a value for " + nice_name);
            form.elements[i].focus();
            return false;
        }
    }
    // now validate the format of the email string.  this
    // function is defined in /emailv.js
    return emailCheck(form.elements['email'].value);
}