function getFormatData() {
    var format;
    format = document.getElementById('format').value;
    
    switch (format) {
    case "a6":
        document.getElementById('length').value = 14.8;
        document.getElementById('width').value = 10.5;
        break;
    case "c6":
        document.getElementById('length').value = 16.2;
        document.getElementById('width').value = 11.4;
        break;
    case "b6":
        document.getElementById('length').value = 17.6;
        document.getElementById('width').value = 12.5;
        break;
    case "a5":
        document.getElementById('length').value = 21.0;
        document.getElementById('width').value = 14.8;
        break;
    case "c5":
        document.getElementById('length').value = 22.9;
        document.getElementById('width').value = 16.2;
        break;
    case "b5":
        document.getElementById('length').value = 25.0;
        document.getElementById('width').value = 17.6;
        break;
    case "a4":
        document.getElementById('length').value = 29.7;
        document.getElementById('width').value = 21.0;
        break;
    case "c4":
        document.getElementById('length').value = 32.4;
        document.getElementById('width').value = 22.9;
        break;
    case "b4":
        document.getElementById('length').value = 35.3;
        document.getElementById('width').value = 25.0;
        break;
    case "own":
        document.getElementById('length').value = '';
        document.getElementById('width').value = '';
        break;
    }
}