Get and Set value into the input fields simultaneously.

HTML:

 <input id="field1" onkeyup="get_set_value_for_field1()" type="text" />
 <input id="field2" onkeyup="get_set_value_for_field2()" type="text" />  

SCRIPT:

 function get_set_value_for_field1() {

            document.getElementById('field2').value = document.getElementById('field1').value;

 }

 function get_set_value_for_field2() {

            document.getElementById('field1').value = document.getElementById('field2').value;

 }