Disable past dates in datepicker js

[shOOter]

I want to disable all the dates in calendar which is lesser than today.I tried adding $("#ctl00_MainContent_tbxLetterDate").datepicker({ minDate: +0 }); But it dosent work, Here is my code..\[code\]$("#ctl00_MainContent_tbxLetterDate").datepicker({ changeYear: true, dateFormat: 'dd/mm/yy', showOn: 'none', showButtonPanel: true }); $("#ctl00_MainContent_tbxLetterDate").attr('readOnly', 'true'); $("#ctl00_MainContent_tbxLetterDate").datepicker({ minDate: +0 }); $("#ctl00_MainContent_imgLetterDate").live("click", function () { $("#ctl00_MainContent_tbxLetterDate").datepicker('show'); return false; });\[/code\]