Remove no selected file on window pressed in js

<div><input type='file' title="Choose a video please" id="aa" onchange="pressed()"><label id="fileLabel">Select New file</label></div>

<style>
input[type=file]{
    width:80px;
    color:transparent;
}

</style>


<script>
window.pressed = function(){
    var a = document.getElementById('aa');
    if(a.value == "")
    {
        fileLabel.innerHTML = "Select New file";
    }
    else
    {
        var theSplit = a.value.split('\\');
        fileLabel.innerHTML = theSplit[theSplit.length-1];
    }
};
</script>