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var timeStamp = new Date().getTime();
document.write('<script type="text/javascript" src="../js/ui.js?timeStamp='+timeStamp+'" charset="utf-8"><\/script>');

// or

document.write('<script type="text/javascript" src="../js/ui.js?timeStamp='+Math.floor(+new Date()/1000)+'" charset="utf-8"><\/script>');