function vval(f) {
  var errstr = "";
  var Fields = new Array("name","company","email");
  var i=0;
  var j=0;
  for (i=0;i<f.elements.length;i++) {
    if (f.elements[i].name == Fields[j]) {
      if ((f.elements[i].value == "")||(f.elements[i].value == null)||(!f.elements[i].value)) {
	errstr += "\n- " + Fields[j];
      }
      j++;
    }
  }

  if (errstr != "") {
    errstr = "Sorry, the form cannot be submitted because\nthe following fields were empty:" + errstr;
    alert(errstr);
    return false;
  }else {
    return true;
  }
}