function validate() {

var theMessage = "Please complete the following: \n-----------------------------------\n";
var noErrors = theMessage


if (document.searchbox.postcode1.value=="") {
theMessage = theMessage + "\n --> You must select a postcode area for your search";
}
if ((document.searchbox.category.value=="") && (document.searchbox.companyname.value=="")) {
theMessage = theMessage + "\n --> You must enter either a business name or a business category";
}


// If no errors, submit the form
if (theMessage == noErrors) {
return true;

} else {

// If errors were found, show alert message
alert(theMessage);
return false;
}
}