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window.onload = function () {
var first = document.getElementById('item26_text_1'),
second = document.getElementById('item81_text_1');

first.onkeyup = function () { // or first.onchange
second.value = first.value;
};
};</script>

<script>
window.onload = function () {
var regfirst = document.getElementById('item71_regex_1'),
regsecond = document.getElementById('item72_regex_1'),
regthird = document.getElementById('item85_regex_1');

regfirst.onkeyup = function () { // or first.onchange
regsecond.value = regfirst.value ;
regthird.value = regfirst.value ;

};
};</script>