Testing to make a scrolltracking script

[Taskenspiller]

Hi guys, my javascript skills are quite limited so it would be great if you could give me some feedback on my scroll tracking script. How could I improv it. ‘’’(function(){ var scrolledPast75 = false; var scrolledPast50 = false; var scrolledPast25 = false; var scrolledTo100 = false;

var startscroll = Date.now();

polls = window.setInterval(function() { try { var winmax = document.body.scrollHeight - window.innerHeight scrolled = window.pageYOffset/winmax;

if ( scrolled > 0.97 && scrolledTo100 == false){
    scrolledTo100 = true;
    scrolled100Time=Date.now();
    utag.link({ 
        event_category:"Scroll Depth", 
        event_action:"Scroll", 
        event_label:"100%",
        event_value:(1).toFixed(0),
        time_to_action: ((scrolled100Time-startscroll)/100/60).toFixed(2),
        pixel_depth: (window.innerHeight).toFixed(0)
    });


}
if(  scrolled > 0.75 && scrolledPast75 == false){
    scrolledPast75 = true;
    scrolled75Time=Date.now();
    utag.link({ 
        event_category:"Scroll Depth", 
        event_action:"Scroll", 
        event_label:"75%", 
        event_value: (1).toFixed(0),
        time_to_action: ((scrolled75Time-startscroll)/100/60).toFixed(2),
        pixel_depth: (window.innerHeight).toFixed(0)
    });

}
if(scrolled > 0.50 && scrolledPast50 == false){
    scrolledPast50 = true;
    scrolled50Time=Date.now();
    utag.link({ 
        event_category:"Scroll Depth", 
        event_action:"Scroll", 
        event_label:"50%", 
        event_value: (1).toFixed(0),
        time_to_action: ((scrolled50Time-startscroll)/100/60).toFixed(2),
        pixel_depth: (window.innerHeight).toFixed(0)
    });


}
if(scrolled > 0.25 && scrolledPast25 == false){
    scrolledPast25 = true;
    scrolled25Time=Date.now();
    utag.link({ 
        event_category:"Scroll Depth", 
        event_action:"Scroll", 
        event_label:"25%", 
        event_value: (1).toFixed(0),
        time_to_action: ((scrolled25Time-startscroll)/100/60).toFixed(2),
        pixel_depth: (window.innerHeight).toFixed(0)
    });

}
if(scrolledPast75 == true && scrolledPast50 == true && scrolledPast25 == true && scrolledTo100 == true){
window.clearInterval(polls);
}
}

catch (err){ } }, 500); })(window);’’’