Calculated Form Fields – Java Code Issue

Hi,

Hoping someone can help me with this Java code snippet. I have a calculated form field in which I am trying to ensure that the end result is divisible by 4. No matter how I code it nothing seems to work? Any ideas?

(function(){
var temp = fieldname10;
if(fieldname3 == 12) { return fieldname10; }

if (fieldname3 == 24) {
if (fieldname10 % 2 == 0) { return fieldname10;}
else {return fieldname10+1;}
}

if (fieldname3 == 48) {
while (fieldname10 % 4 != 0) {temp+1;}

}

})();