var scrollSpeed = 50;
var step = 1;
var current = 0;
var imageHeight = 1500;
var headerHeight = 50;

var resetPosition =  -(imageHeight - headerHeight);

function scrollBg(){
    current -= step;
    
    if (current == resetPosition){
        current = 0;
    }
    
    $('.menuAnimate').css("background-position", "0 "+current+"px");
}
var init = setInterval("scrollBg()", scrollSpeed);

$(document).ready(function(){
    $('.navHover').hover(function(){
        current = 0;
        $(this).toggleClass('menuAnimate', 1000);
        
    });
    
    

});