IE compatibility note-opacity

if we want to use label pic to cover input checkbox.
we use to define of z-index the hierarchy in firefox and chrome,but IE cannot , we use IE practical CSS Paramter to set transparency, but firefox and chrome cannot use.
such as:
.custom-checkbox input {
                filter:alpha(opacity=0);//define for IE
               display: block;//input checkbox show
                z-index: -1;//define for firefox and chrome
}
JSP
<div class="cM-accCheckbox">
<input type="checkbox" name="mailNumbers" id="c_1" value="MM4342">   
<label class="oddrow" for="c_1">&nbsp;</label>
</div>

js
function jpcMessageCtr_inboxCheckEvent(_this) {
      var checkAll = true;
      if (_this.checked) {
            $(_this).next("label").addClass("checked");
            $(_this).attr("checked", true);

      } else {
            if($(_this).next("label").hasClass("checked")){
                  $(_this).next("label").removeClass("checked");
            }
            $(_this).attr("checked", false);
      }
      $(".cA-msgctr-displayPagianationMessageContent").find(":checkbox[name='mailNumbers']").each(function() {
            if (this.checked) {
            } else {
                  checkAll = false;
            }
      });
      if (checkAll) {
            $(".cA-msgctr-displayPagianationMessageContent").find("#CHKBOXALL-1").attr("checked", true);
            $(".cA-msgctr-displayPagianationMessageContent").find("#CHKBOXALL-1").next("label").addClass("checked");
      } else {
            $(".cA-msgctr-displayPagianationMessageContent").find("#CHKBOXALL-1").attr("checked", false);
            if($(".cA-msgctr-displayPagianationMessageContent").find("#CHKBOXALL-1").next("label").hasClass("checked")){
                  $(".cA-msgctr-displayPagianationMessageContent").find("#CHKBOXALL-1").next("label").removeClass("checked");
            }
      }
}

function jpcMessageCtr_inboxCheckEventBind() {
$(".cA-msgctr-displayPagianationMessageContent").find(":checkbox[name='mailNumbers']").each(
  function(index) {
        var self = this;
        $(this).bind("click", function() {
              jpcMessageCtr_inboxCheckEvent(self);
        });
});