Columns give us options to add some constraints for example max char for single line of text etc. I need to add more complex rules on different site columns. For example: For line of text I might want to add min and max number of words allowed to enter and so on.Almost all of these rules are validation rules that need to run when a person clicks on the submit button. But I also need to generate some javascript to have better UI. What are different options to do something like this in SP?Darwaish

This sounds like a perfect job for custom field types. Please review this article: http://msdn.microsoft.com/en-us/library/ms446361.aspxDo note: this will not work in datasheet view or in the document information panel of office.Regards,JeroenMy blog on WSS / MOSS development is found at http://jebass.blogspot.com