Custom SImple WYSIWYG editor

I need a custom WYSIWYG editor that can replace a standard html textarea. The twist being that this editor needs to use custom tags abit like bbcode eg: text text price text bold text and the user sees the Formatting applied. so the user types there text into the editor, and then by selecting text and choosing from a drop down applies these styles. this can probably be adjusted from an existing wysiwig editor ## Deliverables 1) a custom WYSIWYG editor, that is output at a set pixel dimension. 2) A drop down list of custom tags 3) tags applied by selecting text and then choosing tag. 4) the tag (style) selection must then be reflected in the editor 5) I editor can use standard markup to reflect the styles changes, I just need it to outpu the custom tags (perhaps using a hidden field. 6) I must be able to add extra styles, 7) this could use a database, to define the styles. ## Platform javascript, can use php and mysql, ajax is always good.