i want to validate my checkbox by using javascript

hi Prabhu Why do u use javascript for that purpose.U can simply validate by adding validation fields. if u want to require javascript use the following function function check() { /* here txt is the id of the TextBox */ var val=document.getElementById('txt').value var patern=/^[\s+\d+]/ if(patern.test(val)) alert('You have Entered an invalid text'); else alert('valid'); } for getting the value of check box inside the script use the dom expression document.getElementById('chkBox').value here chkBox is the id of checkbox