Here's a script for LimeSurvey version 2.5x:
A sample survey:
<script type="text/javascript" charset="utf-8">
$(document).ready(function() {
// Identify this question
var thisQuestion = $('#question{QID}');
$('input[type="text"]', thisQuestion).on('slide slideStop', function(event, ui) {
var otherSlider = $('input[type="text"]', thisQuestion).not(this);
otherSlider.bootstrapSlider('setValue', 100 - $(this).val());
});
});
</script>
A sample survey: