Apply to all fields?

I have a script that copy value from one "master" selectbox to all another selectboxes.
How I can add one master text field that can do the same to the another text fields?

<script type="text/javascript">
function applyToAll()
{
for (var i=0; i< document.MYFORMNAME.length; i++) {
document.MYFORMNAME[i].selectedIndex = document.MYFORMNAME.NAMEOFMAINSELECT.selectedIndex ;
}
}
</script>

Thanks in advanced,

-Event

Oh, sorry...I figured it out myself...

-Event