Assistance with z index causing various errors

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CSS

style

HTML5

Please have a look at this webpage - http://dev.topyaps.com/how-awesome-are-you

This post is built by a wordpress plugin that I developed. I am facing various issues because of the z index property of elements. The issues are -

1) On scroll the menu merges with the floating bar on the page. CSS of menu -

kodda_container {
    z-index: 999 !important;
    width: 1220px;
    height: 40px !important;
    background-color: ;
    border-top: solid transparent;
    border-right: solid transparent;
    border-bottom: solid transparent;
    border-left: solid transparent;
    background-image: -webkit-linear-gradient(top, transparent, transparent);
}

Css of floating bar -

.scoreBox {
    background: #fafafa;
    border: 1px solid #d1d1d1;
    width: 100%;
    z-index: 997;
}

2) On clicking the submit button a center box appears. The center box has to be on the top while it hides.

Css of center box -

element.style {
    padding: 6px;
    word-wrap: break-word;
    position: fixed;
    top: 50%;
    left: 50%;
    margin-top: -18px;
    margin-left: -206px;
    z-index: 999;
    display: block;
}

3) Try clicking on login and register button on the homepage - http://dev.topyaps.com/.
This is the actual styling of the login/register popup. But in the post "How awesome are you?" , when we click on login/register the styling changes to the styling of the center box (the one that appears on clicking the Submit button).

Css of login box -

element.style {
    display: block;
    position: fixed;
    top: 50%;
    left: 50%;
    margin-top: -163.5px;
    margin-left: -230px;
    z-index: 10001;
}

Please try to tell me the way by which I can fix these issues.


[Edit member="Tadit"]
Added pre tags.
[/Edit]