InsertHtml() doesn't work when using createHtml()

Hello world...

I'm using fck.CreateHtml(); because I want to change the width depending on a value I sent to this function on my JS:

function changeWidthEditor( value ){

var div = document.getElementById("text");
var fck = new FCKeditor("text");
fck.BasePath = "/lib/fckeditor/";
fck.ToolbarSet = 'NewBasic';
fck.Config['SkinPath'] = 'skins/silver/';
fck.InsertHml(div.innerHTML);

if(value == 1){
fck.Width = '340px';
fck.Height = '300px';

}else{
fck.Width = '640px';
fck.Height = '410px';
}

div.innerHTML = fck.CreateHtml();
}

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if I use fck.InsertHml(div.innerHTML); or even fck.InsertHml("<p>Hello world</p>"); the editor disappear!!!!

any idea?