function verify() {
  var alerttext = " ";
  var commentText = " ";
  var commentPosition = -1;
  if (sendemail.yourcomment.value.length < 5) {
    alerttext = "Please enter your comment";
    sendemail.yourcomment.focus();
  } 
  if (sendemail.yourcomment.value.length > 512) {
    alerttext = "Please shorten your comment";
    sendemail.yourcomment.focus();
  } 
  commentText = sendemail.yourcomment.value.toLowerCase();
  commentPosition = commentText.indexOf("viagra");
  if (commentPosition > -1) {
    alerttext = "Your comments are inappropriate";
    sendemail.yourcomment.focus();
  }
  if ((sendemail.yourzip.value.length < 5) | (sendemail.yourzip.value.length > 10)) {
    alerttext = "Please enter your ZIP code";
    sendemail.yourzip.focus();
  }
  if (sendemail.yourzip.value == "12345") {
    alerttext = "Please enter a valid ZIP code";
    sendemail.yourzip.focus();
  } 
  if ((sendemail.youremail.value.length < 8) | (sendemail.youremail.value.length > 50)) {
    alerttext = "Please enter a valid email address";
    sendemail.youremail.focus();
  }
  commentPosition = sendemail.youremail.value.indexOf("@");
  if (commentPosition == -1) {
    alerttext = "Please enter a valid email address";
    sendemail.youremail.focus();
  }
  if ((sendemail.yourname.value.length < 5) | (sendemail.yourname.value.length > 30)) {
    alerttext = "Please enter your full name";
    sendemail.yourname.focus();
  } 
  if (alerttext!=" ") {
    alert(alerttext);
    return false;
  }
}