How to zoom on mouse wheel in asp.net

$(document).ready(function(){
    $('#main').bind('wheel mousewheel', function(e){
        var delta;

        if (e.originalEvent.wheelDelta !== undefined)
            delta = e.originalEvent.wheelDelta;
        else
            delta = e.originalEvent.deltaY * -1;

            if(delta > 0) {
                $("#main").css("width", "+=10");
            }
            else{
                $("#main").css("width", "-=10");
            }
        });
    });