JQuery scrollTop在Chrome中导致问题

我希望一些天才可以帮助我调试我的JQuery函数。它在Firefox和Safari上运行良好，但在Chrome上却无法完全渲染背景。奇怪的是，如果我以任何方式调整浏览器窗口的大小，它会自行修复。

当你向下滚动网页时，JQuery也会导致顶部导航栏的悬停属性失效。

我是一个编码新手，所以我真的需要一些帮助。我确信它与"窗口"有关。但我真的不知道。

你可以访问我的网站:这里

我创建了一个JFiddle: Here

和我已经粘贴我的Javascript/JQuery下面:

$("document").ready(function() {
    flag=true;
    $(window).scroll(function(){
        st = $(window).scrollTop();
        if(st>170){
            if(flag);
            $("#flipBox_contain").css("opacity", ".2");
            $("#flipBox_contain").css({"position": "relative"});
        }
        else if(st<170){
            if(flag);
            $("#flipBox_contain").css("opacity", "1");
            $("#flipBox_contain").css("position", "");
        }
        if(st>400){
            if(flag);
            $("#introText").css("opacity", ".2");
            $("#introText").css({"position": "relative"});
        }
        else if(st<400){
            if(flag);
            $("#introText").css("opacity", "1");
            $("#introText").css("position", "");
        }
        if(st>500){
            if(flag);
            $("#psLogo").css("top","0px");
            $("#psLogo").css("opacity","1");
            $("#psBar").css("width","98%");
            $("#psLabel").css("opacity","1");
            $("#psSkill").css("opacity","1");
            setTimeout (function(){
                $("#aiLogo").css("top","0px");
                $("#aiLogo").css("opacity","1");
                $("#aiBar").css("width","93%");
                $("#aiLabel").css("opacity","1");
                $("#aiSkill").css("opacity","1");
            }, 500);
            setTimeout (function(){
                $("#htmlLogo").css("top","0px");
                $("#htmlLogo").css("opacity","1");
                $("#htmlBar").css("width","80%");
                $("#htmlLabel").css("opacity","1");
                $("#htmlSkill").css("opacity","1");
            }, 1000);
            setTimeout (function(){
                $("#cssLogo").css("top","0px");
                $("#cssLogo").css("opacity","1");
                $("#cssBar").css("width","80%");
                $("#cssLabel").css("opacity","1");
                $("#cssSkill").css("opacity","1");
            }, 1500);
            setTimeout (function(){
                $("#javaLogo").css("top","0px");
                $("#javaLogo").css("opacity","1");
                $("#javaBar").css("width","60%");
                $("#javaLabel").css("opacity","1");
                $("#javaSkill").css("opacity","1");
            }, 2000);
            setTimeout (function(){
                $("#phpLogo").css("top","0px");
                $("#phpLogo").css("opacity","1");
                $("#phpBar").css("width","40%");
                $("#phpLabel").css("opacity","1");
                $("#phpSkill").css("opacity","1");
            }, 2500);
            /*setTimeout (function(){$("#psLabel").css("opacity","1")}
            , 1600);
            setTimeout (function(){$("#psSkill").css("opacity","1")}
            , 2100)*/
        }
        else if (st<170){
            if(flag);
            $("#psLogo").css("top","100px");
            $("#psLogo").css("opacity","0");
            $("#psBar").css("width","0");
            $("#psLabel").css("opacity","0");
            $("#psSkill").css("opacity","0");
            setTimeout (function(){
                $("#aiLogo").css("top","100px");
                $("#aiLogo").css("opacity","0");
                $("#aiBar").css("width","0");
                $("#aiLabel").css("opacity","0");
                $("#aiSkill").css("opacity","0");
            }, 500);
            setTimeout (function(){
                $("#htmlLogo").css("top","100px");
                $("#htmlLogo").css("opacity","0");
                $("#htmlBar").css("width","0");
                $("#htmlLabel").css("opacity","0");
                $("#htmlSkill").css("opacity","0");
            }, 1000);
            setTimeout (function(){
                $("#cssLogo").css("top","100px");
                $("#cssLogo").css("opacity","0");
                $("#cssBar").css("width","0");
                $("#cssLabel").css("opacity","0");
                $("#cssSkill").css("opacity","0");
            }, 1500);
            setTimeout (function(){
                $("#javaLogo").css("top","100px");
                $("#javaLogo").css("opacity","0");
                $("#javaBar").css("width","0");
                $("#javaLabel").css("opacity","0");
                $("#javaSkill").css("opacity","0");
            }, 2000);
            setTimeout (function(){
                $("#phpLogo").css("top","100px");
                $("#phpLogo").css("opacity","0");
                $("#phpBar").css("width","0");
                $("#phpLabel").css("opacity","0");
                $("#phpSkill").css("opacity","0");
            }, 2500);
        }//--closes else if
        else{flag=false;}
    }); //--closes window.scroll function
}); //--closes document ready function