Undefined?

Code:

---

function Do_Calc(a,b,c,d){
var a_1,b1,c_1,d_1;
if((c == "picom") && (d=="km")){
b1 = a / 1000000000000000;
}
alert(b1.length);
}

---

b1.length returns undefined!!!? please help.

try:

Code:

---

b1.toString().length

---

think the S is uppercase.