function doUpload() {
    showModal();
    document.getElementById('form').submit();
}

function handleKeyPress(e){
    var key=e.keyCode || e.which;
    if (key==13){
        doUpload();
    }
}

function showModal() {
    document.getElementById('cover').style.display='block';
}

function hideModal() {
    document.getElementById('cover').style.display='none';
}