1$("#button").attr("disabled", true);

1//jQuery 1.6+ use:
2$("#submitButtonID").prop('disabled', true); //disable 
3$("#submitButtonID").prop('disabled', false); //enable
4
5//jQuery 1.5 and below use:
6$("#submitButtonID").attr('disabled','disabled'); //disable 
7$("#submitButtonID").removeAttr('disabled'); //enable

1function disable(i){
2    $("#rbutton_"+i).prop("disabled",true);
3}