function valid_contact(f) {
  f.elements['firstname'].optional=false;
  f.elements['surname'].optional=false;
  f.elements['company'].optional=true;
  f.elements['position'].optional=true;
  f.elements['email'].optional=false;
  f.elements['roof'].optional=true;
  f.elements['size'].optional=true;
  f.elements['query'].optional=true;
  for(i=0;i<f.elements.length;i++) {
    if((f.elements[i].type=='text'|f.elements[i].type=='textarea')&!f.elements[i].optional&f.elements[i].value=='') {
      alert('Please complete all required fields and try again');
      f.elements[i].focus();
      return false;
    }
  }
  f.elements['realname'].value=f.elements['firstname'].value+' '+f.elements['surname'].value;
  return true;
}

function validAdmDownloads(f) {
  f.elements['down_title'].optional=false;
  f.elements['down_desc'].optional=false;
  if(f.elements['action'].value=='add') f.elements['image'].optional=false;
  for(i=0;i<f.elements.length;i++) {
    if((f.elements[i].type=='text'|f.elements[i].type=='textarea'|f.elements[i].type=='file')&!f.elements[i].optional&f.elements[i].value=='') {
      alert('Please complete all required fields and try again');
      f.elements[i].focus();
      return false;
    }
  }
  return true;
}