izpis letnice v javascriptu

< script type="text/javascript" >
var entered = new Array(51);
entered[0] = 1819;
entered[1] = 1959;
entered[2] = 1912;
entered[3] = 1836;
entered[4] = 1800;
entered[5] = 1825;

var states = new Array(51);
states[0] = "Ljubljana";
states[1] = "celje";
states[2] = "Maribor";
states[3] = "Gorica";
states[4] = "Kocevje";
states[5] = "Leskovec";

function getStateDate(){
var vpisano = document.getElementById("output").value;
for(var i = 0; i < states.lenght; i++){
if(states[i] == vpisano){
break;
}
}
var msg = states[i] + " je " + entered[i];
document.getElementById("output").value = msg;
}
< /script >

---

< form name="entryform" >
Enter the name of state:
< input type="text" size="15" name="entry" id="output" />
< input type="button" value="Klikni za rezultat"
onClick="getStateDate()" />


< /form >

sledec program mi noce izpisati letnice nstanka ko vpisem v celico ime mesta, izpise mi vedno ljubljano pa ce vpisem celje ali katerokoli drugo mesto.
letnice so izmisljene!!!