if your menu is dynamically created, you could create an extra field in the database to display an arrow image and control the display in your cms as 'show arrow: yes/no' response
Existing Navigation_Page_Name database field name
Create New Navigation_Page_Arrow database field name
- if Yes populate field to the full url of the arrow image on your server
... eg arrow.gif
- if No set to blank or a full url spacer.gif
Then in the menu wizard, set the Page name to display the image field before the the name field
... ie Navigation_Page_Arrow Navigation_Page_Name
... space between Navigation_Page_ArrowNavigation_Page_Name optional depending on how much right spacing you use on the arrow.
Obviously create the arrow image height based on your css font size, and you would have to remove the css style sheet to not show the background arrow.
Hope the work a round helps ... can you offer any return help on setting up a dynamic nested menu see thread showthread.php?t=21453