function clearText(thefield){
if(thefield.defaultValue=thefield.value)
thefield.value=""}
var isNN=(navigator.appName.indexOf("Netscape")!=-1)
function autoTab(input,len,e){
var keyCode=(isNN)? e.which : e.keyCode
var filter=(isNN)? [0,8,9] : [0,8,9,16,17,18,37,38,39,40,46]
if(input.value.length>=len&&!containsElement(filter,keyCode)){
input.value=input.value.slice(0,len)
input.form[(getIndex(input)+1)% input.form.length].focus()}
function containsElement(arr,ele){
var found=false,index=0
while(!found&&index<arr.length)
if(arr[index]==ele)
found=true
else
index++
return found}
function getIndex(input){
var index=-1,i=0,found=false
while(i<input.form.length&&index==-1)
if(input.form[i]==input)index=i
else i++
return index}
return true}