function validate(f) {
var error = "";
var errlvl = 0;
if (f.name.value == "") {
error = error + "Please enter your name.\n\r";
errlvl =1;
}
if (f.address.value == "") {
error = error + "Please enter an address.\n\r";
errlvl =1;
}
if (f.telephone.value == "") {
error = error + "Please enter your telephone number.\n\r";
errlvl =1;
}
if (f.email.value == "") {
error = error + "Please enter your email address.\n\r";
errlvl =1;
}
if (f.hire.value == "") {
error = error + "Please enter a hire date and time.\n\r";
errlvl =1;
}
if (f.hreturn.value == "") {
error = error + "Please enter a return date and time.\n\r";
errlvl =1;
}
if (f.reg.value == "") {
error = error + "Please enter your vehicle registration number.\n\r";
errlvl =1;
}

if (errlvl ==1) {
alert(error);
return false;
} else {
return true;
}
}