Custom feature: Switchsource keep selection

To make the editor fit in our project we made some changes that we want to share with others:


(When a text had been selected and the view is changed from or to source it tries to recreate the selection under the new view)

fck_editor.js:

function switchEditMode()
{
var bSource = (trSource.style.display == "none") ;



if (bSource)
{
// ** Non Orrigional Code **
var sOrigHTML = "";
oSel = objContent.DOM.selection;
if(oSel){
if(oSel.type == "Text"){
oRangeStart = oSel.createRange();
oRangeEnd = oRangeStart.duplicate();
oRangeStart.collapse(true);
oRangeEnd.collapse(false);
oRangeStart.text = "%SelStart%";
oRangeEnd.text = "%SelEnd%"
}

if(oSel.type == "Control"){
var oRange = oSel.createRange() ;
oRange.item(0).insertAdjacentText("beforeBegin", "%SelStart%");
oRange.item(oRange.length - 1).insertAdjacentText("afterEnd", "%SelEnd%");
}
}

// ** Non Orrigional Code End **
txtSource.value = objContent.DOM.body.innerHTML ;
}
else
{
// ** Non Orrigional Code **
txtSource.focus();
var oSel = document.selection;
if(oSel){
if(oSel.type == "Text"){
oRangeStart = oSel.createRange();
oRangeEnd = oRangeStart.duplicate();
oRangeStart.collapse(true);
oRangeEnd.collapse(false);
oRangeStart.text = "%SelStart%";
oRangeEnd.text = "%SelEnd%"

}

}
// ** Non Orrigional Code End **

objContent.DOM.body.innerHTML = "<div id=__tmpFCKRemove__>&nbsp;</div>" + txtSource.value ;
objContent.DOM.getElementById('__tmpFCKRemove__').removeNode(true) ;
}


trSource.style.display = bSource ? "inline" : "none" ;


// ** Non Orrigional Code **


if(bSource){
document.selection.empty();
var oStart = txtSource.createTextRange();
}else{
objContent.DOM.selection.empty();
oStart = objContent.DOM.body.createTextRange();
}


oEnd = oStart.duplicate();
if(oStart.findText("%SelStart%")){
oStart.text = "";
if(oEnd.findText("%SelEnd%")){

oEnd.text = "";
oStart.setEndPoint("EndToEnd", oEnd);
oStart.select();
oStart.scrollIntoView();
}else{
if(bSource){
txtSource.value = delSelSigns(txtSource.value);
}else{
objContent.DOM.body.innerHTML = delSelSigns(objContent.DOM.body.innerHTML);
}
}

}else{
if(bSource){
txtSource.value = delSelSigns(txtSource.value);
}else{
objContent.DOM.body.innerHTML = delSelSigns(objContent.DOM.body.innerHTML);
}
}


// ** Non Orrigional Code End **


trEditor.style.display = bSource ? "none" : "inline" ;
events.fireEvent('onViewMode', bSource) ;
}

// ** Non Orrigional Code **
function delSelSigns(sText){
sText = sText.replace(/%SelStart%/g, "");
sText = sText.replace(/%SelEnd%/g, "");
return sText;
}
// ** Non Orrigional Code End **