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<input type="text" name="key1" maxlength="6" size="6" onkeyup="CodeNext(1);"> - <input type="text" name="key2" maxlength="4" size="4" onkeyup="CodeNext(2);"> - <input type="text" name="key3" maxlength="5" size="5" onkeyup="CodeNext(3);">
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<script language="JavaScript" type="text/javascript"> function CodeNext (num) { var event = window.event; var code = event.which; if (num == 1) { if (document.forms[0].key1.value.length == 6) { if ((code != 37) && (code != 39)) { document.forms[0].key2.focus(); } else if ((code == 39) && (document.forms[0].key1.selectionStart == 6) && (document.forms[0].key1.selectionEnd == 6)) { document.forms[0].key2.focus(); } } } else if (num == 2) { if (document.forms[0].key2.value.length == 4) { if ((code != 37) && (code != 39)) { document.forms[0].key3.focus(); } else if ((code == 39) && (document.forms[0].key2.selectionStart == 4) && (document.forms[0].key2.selectionEnd == 4)) { document.forms[0].key3.focus(); } } else if ((document.forms[0].key2.selectionStart == 0) && (document.forms[0].key2.selectionEnd == 0)) { if (code == 37) { document.forms[0].key1.focus(); } } } else { if (document.forms[0].key3.selectionStart == document.forms[0].key3.selectionEnd) { if (document.forms[0].key3.selectionStart == 0) { if (code == 37) { document.forms[0].key2.focus(); } } } } } </script>
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else if (num == 2) { if (document.forms[0].key2.value.length == 4) { if ((code != 37) && (code != 39)) { document.forms[0].key3.focus(); } else ((code == 39) && (document.forms[0].key2.selectionStart == 4) && (document.forms[0].key2.selectionEnd == 4)) { document.forms[0].key3.focus(); } } else ((document.forms[0].key2.selectionStart == 0) && (document.forms[0].key2.selectionEnd == 0)) { if (code == 37) { document.forms[0].key1.focus(); } }