First of all i would like to thanks to Liam Cleary for this Article.
Please find the below links which shows that how to hide/customize existing ecb menu item within WSS/MOSS.
- http://www.helloitsliam.com/archive/2007/05/30/moss2007-%E2%80%93-javascript-item-menus-part-1-real-world.aspx
- http://www.helloitsliam.com/archive/2007/08/10/moss2007-%E2%80%93-item-level-menus-investigation.aspx
