[jQuery] Apply alpha filter via css dynamically not working IE7

[jQuery] Apply alpha filter via css dynamically not working IE7


I am trying to apply this
.applyOpacity {
    background: #fff;
    filter:alpha(opacity=50);
    -moz-opacity:0.50;
    -khtml-opacity: 0.50;
    opacity: 0.50;
}
To an existing DIV dynamically via a hover and in IE7 this fails. Is
that correct? should I do this differently?
this is function
$("#talentThumb li a").hover(function(e) {
        $(this).parent().addClass('hoverSlide');
        $('#talentThumb li a').addClass('applyOpacity');
        $(this).toggleClass('applyOpacity');
    }, function() {
        $(this).parent().removeClass('hoverSlide');
        $('#talentThumb li a').removeClass('applyOpacity');
    });
Thanks