jQuery Image Slider nefunkční js

sliderInt = 1;
sliderNext = 2;

$(document).ready(function(){
    $("#slider > Img#1").fadeIn(300);
    startSlider();
});

function startSlider(){
    count = $("#slider > Img").size();
    
    loop = setInterval(function(){
    
        if(sliderNext > count){
            sliderNext = 1;
            sliderInt = 1;
        }
    
        $("#slider > Img").fadeOut(300);
        $("#slider > Img#" + sliderNext).fadeIn(300);
        
        sliderInt = sliderNext;
        sliderNext = sliderNext + 1;
    
    }, 3000)
}