jQuery Adicionar desativado ao botão
$("#button").attr("disabled", true);
Breakable Beetle
$("#button").attr("disabled", true);//jQuery 1.6+ use:
$("#submitButtonID").prop('disabled', true); //disable
$("#submitButtonID").prop('disabled', false); //enable
//jQuery 1.5 and below use:
$("#submitButtonID").attr('disabled','disabled'); //disable
$("#submitButtonID").removeAttr('disabled'); //enablefunction disable(i){
$("#rbutton_"+i).prop("disabled",true);
}