var table = $("table[for='availableTimeRanges']");

$.each($("table"), function(i,n){
        alert($(n).attr("for")

});

$(function () {

        $('table[forparam=availableTimeRanges]').each(function () {
            alert($(this).attr('forparam'));
        });

    });

<table class="for_availableTimeRanges"></table>

$('.for_availableTimeRanges')

$(function(){
   $.each($("table"), function(i,n){
        alert($(n).attr("for")
   });
});