Javascript within a form

I'm trying to have the select box change when I pick a specific array. Why won't this work.

// Continental US Options
contus1List = new Array(
contus2List = new Array(
contus3List = new Array(6)

// Weather and Temperature Aloft
contus1List[0] = "Flight Level 5,000"
contus1List[1] = "Flight Level 10,000"
contus1List[2] = "Flight Level 18,000"
contus1List[3] = "Flight Level 24,000"
contus1List[4] = "Flight Level 30,000"
contus1List[5] = "Flight Level 34,000"
contus1List[6] = "Flight Level 39,000"
contus1List[7] = "Flight Level 45,000"

// Upper Air Analysis
contus2List[0] = "Flight Level 5,000"
contus2List[1] = "Flight Level 10,000"
contus2List[2] = "Flight Level 18,000"
contus2List[3] = "Flight Level 24,000"
contus2List[4] = "Flight Level 30,000"
contus2List[5] = "Flight Level 34,000"
contus2List[6] = "Flight Level 39,000"
contus2List[7] = "Flight Level 45,000"

// Hazards and High Level Significant Weather
contus3List[0] = "US Turbulence Report"
contus3List[1] = "US Convective SIGMENTS"
contus3List[2] = "US Convective Outlook"
contus3List[3] = "US Icing Reports"
contus3List[4] = "US Icing 12 Hour Forcast"
contus3List[5] = "US High Level Significant Weather Forecast"

// change options
function setLang(which) {
var listObj = document.forms[0].level
// find out how many entries
var listLength = listObj.length
//replace individual existing entries
for (var i = 0; i < listLength; i++) {
if (which == "contus1") {
listObj.options[i].text = contus1List[i]
} else if (which == "contus2") {
listObj.options[i].text = contus2List[i]
} else if (which == "contus3") {
listObj.options[i].text = contus3List[i]
}
}
if (navigator.appName == "Netscape") {
history.go(0)
}
}

// create entirely new object list
function setCount(choice) {
var listObj = document.forms[0].level
// get language setting
var lang
if (document.forms.wx[0].checked) {
lang = "contus1"
} else if (document.forms[0].wx[0].checked) {
lang = "contus2"
} else if (document.blah.wx[0].checked) {
lang = "contus3"
}

// empty options from list
listObj.length = 0
// create new option object for each entry
for (var i = 0; i < choice.value; i++) {
if (lang == "contus1") {
listObj.options[i] = new Option(contus1List[i])
} else if (lang == "contus2") {
listObj.options[i] = new Option(contus2List[i])
} else if (lang == "contus3") {
listObj.options[i] = new Option(contus3List[i])
}
}
listObj.options[0].selected = true
if (navigator.appName == "Netscape") {
history.go(0)
}
}

Choose One

Wind and Tempertures Aloft

Upper Air Analysis

Hazards and High Level Significant Weather

SubCatagory

Choose One