function checkform(form)
{if(form.firstname.value==""){alert("Please enter your first name.");form.firstname.focus();return false;}
if(form.lastname.value==""){alert("Please enter your last name.");form.lastname.focus();return false;}
if(form.email.value==""){alert("Please enter your email address.");form.email.focus();return false;}
if(form.comment.value==""){alert("Please tell us about your project.");form.comment.focus();return false;}
return true;}