Cannot type text when initiated with .replace(*);

Hi,

I'm wondering if anyone can help with a little problem i'm having.

If I initiate an editor by class name, it editor works brilliantly!

However, if I use...

var ck = CKEDITOR.editor.replace('pageContent');

The editor loads, but I cannot type in it and the toolbars are unresponsive.

Any ideas how to fix this?

Any help appreciated.

Thanks
Adrian