Clicking the last tab makes the page inside the editor lightbox iframe reload so that the editor is inline with the joomla content, when this happens any content that's been typed into the editor is lost:The error is:Message: 'document.getElementById(...)' is null or not an object
and it refers to this block of code in simpletabs_1.3.js and I've bolded the line it refers to at the bottom:// change to clicked anchor        var otherLinks = elm.parentNode.parentNode.getElementsByTagName("a");        for(var n=0; n<otherLinks.length; n++){            otherLinks[n].className = "";        }        elm.className = kmrSimpleTabs.sbCurrentNavClass;                // change to associated div        var otherDivs = document.getElementById(thisContainerID).getElementsByTagName("div");        var RegExpForContentClass = new RegExp(kmrSimpleTabs.sbContentClass);        for(var i=0; i<otherDivs.length; i++){            if ( RegExpForContentClass.test(otherDivs.className) ) {                otherDivs.className = kmrSimpleTabs.sbContentClass;            }        }        document.getElementById(thisContainerID+"_div_"+thisLinkPosition).className = kmrSimpleTabs.sbContentClass+" "+kmrSimpleTabs.sbCurrentTabClass;

Hi Zig zag,

I'm checking the code and will make a feedback asap.

Olivier