IndentClasses
FCKeditor allows the use of CSS classes for block indentation.
Example:we create a CSS file called 'indent.css' with the following code:
p { text-indent: 70px; }
We apply the file to the IndentClass option:
FCKConfig.IndentClasses = ["mycssstyles/indent.css/"] ;
NOTE: If you use this option the settings of IndentLength and the IndentUnit will be override.