function ValidLength(field, len) {
   return (field.length >= len);
}

function validate() {
errmsg = "";
errcnt=0;
if (!ValidLength(document.webreq.email.value,1))
   error(document.webreq.email, "Please enter your email address");
if (!ValidLength(document.webreq.name.value,1))
   error(document.webreq.name, "Please enter your name");
if (!ValidLength(document.webreq.booktitle.value,1))
   error(document.webreq.name, "Please enter the title of your book");
if (errcnt > 0) {
   alert(errmsg);
   return false;
}
return true;
}

function error(elem, text) {
errmsg += text;
errmsg += "\n";
errcnt++;
if (errcnt > 1) return;
elem.select();
elem.focus();
}