Editor disappears when parameters added

I have installed CKeditor, and am really impressed.

However, I cannot seem to set parameters in-page.

i.e.

CKEDITOR.replace( 'editor1');

displays perfectly

As soon as I add other parameters such as

CKEDITOR.replace( 'editor1',
    {
        toolbar : 'basic',
        uiColor : '# 9AB8F3'
    });

The text editor disappears.

This happens on both Safari 4.0.3 and Firefox 3.0.11

I have not changed any of the original configuration files.

Any help would be much appreciated