code: function(h, skip_undo) {
  			var ed = this.editor, r = ed.selection.getRng();
  
  			// First delete the contents seems to work better on WebKit when the selection spans multiple list items or multiple table cells.
  			if (!ed.selection.isCollapsed() && r.startContainer != r.endContainer)
  				ed.getDoc().execCommand('Delete', false, null);
  
  			ed.execCommand('mceInsertContent', false, h, {skip_undo : skip_undo});
  		}
docs: Inserts the specified contents at the caret position.