Editor adds extra code

I could use some help here, when a POST gets submitted I've been finding CKEditor is adding some extra JS to the POST -

function SOswitchMenu() {var el = document.getElementById(\'bodyDiv\');if ( el.style.display != \"none\" ) { el.style.display = \'none\';}else { el.style.display = \'\';}var el2 = document.getElementById(\'h2\');if ( el2.className == \"calHeader goog-zippy-expanded normalText\" ) { el2.className = \"calHeader goog-zippy-collapsed normalText\";return;}if ( el2.className == \"calHeader goog-zippy-collapsed normalText\" ) { el2.className = \"calHeader goog-zippy-expanded normalText\";return;}} function SOframeReload() {var f = document.getElementById(\'soFrame\');f.src = f.src;}

Why is it doing this? How can I make it stop?
Thanks,
CH