Using multiple instance on the same page i need:
- to load the toolbar only when a textarea is focused

   This feature can be implemented.When textarea is focused, you can set the style of class "CuteEditorToolBarContainer" and let it be displayed, if textarea is not focused, set its style to "display:none"

- to change height, border's colors and background's color when a textarea is focused

   You can set editor property and implement this customization, please use $editor->Height,$editor->BorderColor,$editor->BackColor

- to load a free file browser to upload images and multimedia

   Please click button "Insert Image", and "Insert Media"

- to load a free plugin to insert math's formulas without know tex

   Please click button "Insert Special Characters","Superscript Text","Subscript Text", you can write some math formula in editor area.

- must be possible to retrieve math's formulas from db to use it in a pdf created on fly

   All content stored in db can be retrieved from db and loaded into editor area, converting html to pdf is not supported in cuteeditor for php,it is only available in cuteeditor for .net

I need also that all these things works on various browsers, as Internet Explorer, Firefox, Safari, Chrome and Opera.

   CuteEditor supports cross-browser,  it is compatible with IE,Firefox,Safari,Chrome, and Opera

Regards,

Eric