If else (multiple conditions)

Hi.
I'm triyng to set a warning based on multiple conditions.

Fieldname33 is a currency field
Fieldaname40 is a radio button (first 4 fields value is zt1, last field value is zt2)
Fieldname41 is a calculated field with function inside

Conditions:
No selection on radio = soft WARNING
If zt1 AND fieldname33 value > 150000 = WARNING
If zt2 AND fieldname33 value > 100000 = WARNING
Else = OK

I started from your previuos example on another thread:

(function(){
var va = fieldname33;
var zt = fieldname40|r,
tag = getField(fieldname41|n).jQueryRef().find('input');

if ((zt != 'zt1') || (zt != 'zt2')) {

tag.css({background:'orange', color:'white', fontWeight:'bold'});
return 'Seleziona Zona Territoriale';
}

else if (zt == 'zt1' && va >150000) {

tag.css({background:'red', color:'white', fontWeight:'bold'});
return 'Rischio non assumibile per valore massimo superiore a € 150.000,00';
}

else if ((zt == 'zt2' && va >100000) {

tag.css({background:'red', color:'white', fontWeight:'bold'});
return 'Rischio non assumibile per valore massimo superiore a € 100.000,00';
}

else {

tag.css({background:'green', color:'white', fontWeight:'bold'});
return 'OK';
}

})()

Where I'm wrong?
Or there is a better way to?

Thanks in advance.