function validate() {

if (tickets.First_Name.value == "") {
alert("\nThe first name field is blank.\n\nPlease enter your first name.")
tickets.First_Name.focus();
return false;
}
if (tickets.Last_Name.value == "") {
alert("\nThe last name field is blank.\n\nPlease enter your last name.")
tickets.Last_Name.focus();
return false; 
}

var validphone = "0123456789"
var ok = "yes";
var tempphone;
for (var i=0; i<tickets.phone.value.length; i++) {
tempphone = "" + tickets.phone.value.substring(i, i+1);
if (validphone.indexOf(tempphone) == "-1") ok = "no";
}
if ((ok == "no") || (tickets.phone.value.length > 10) || ((tickets.phone.value.length > 0) && (tickets.phone.value.length < 10))) {
alert("Please type in your 10 digit billing pnone number, like 5553330000.\n\nPlease don\'t use letters, spaces or hyphens");
tickets.phone.focus();
return false;

   }
if (tickets.phone.value == "") {
alert("\nThe phone field is blank.\n\nPlease enter your phone number.")
tickets.phone.focus();
return false;
}

if (tickets.email.value == "") {
alert("\nThe E-MAIL field is blank.\n\nPlease enter your e-mail address.")
tickets.email.focus();
return false;
}


document.tickets.submit();
}