// (C) Roy van Lunsen

function I(a) {
        return document.getElementById(a);
}

function C(a) {
        return document.getElementsByClassName(a);
}

function T(a) {
        return document.getElementsByTagName(a);
}

function S() {
var r = (Math.random()*36).toString(36).substring(2);
var f = Math.random().toString().replace(/^0\./, '');
//f = f*10**(f.toString().length-2);
var g = '';
for (var i=0; f.length > i && r.length > i; i++) {
if (f.charAt(i) >= 5) {
g += r.charAt(i).toUpperCase();
} else {
g += r.charAt(i);
}
}
return g;
}

function G(i, s, o, r) {
if (i % 8 === 0) {
var li = document.createElement('li');
ol = document.createElement('ol');
ol.setAttribute('class', 'x-row');
I('y-co').appendChild(li);
li.appendChild(ol);
}
var li = document.createElement('li');
li.setAttribute('id', s);
if (null === o || undefined === o || '' === o) {
li.setAttribute('class', 'coord empty');
ol.appendChild(li);
} else {
li.setAttribute('class', 'coord piece');
ol.appendChild(li);
if (r === undefined) {
var img = document.createElement('img');
var prop = o.substring(1, 2);
img.setAttribute('id', o);
img.setAttribute('src', 'i/' + o.substring(0, 2) + '.png');
img.setAttribute('alt', pp[o.substring(0, 1)] + ' ' + pn[prop] + ' on ' + s);
li.appendChild(img);
} else {
var pce = I(o);
if (pce === null) {
var img = document.createElement('img');
var prop = o.substring(1, 2);
img.setAttribute('id', o);
img.setAttribute('src', 'i/' + o.substring(0, 2) + '.png');
img.setAttribute('alt', pp[o.substring(0, 1)] + ' ' + pn[prop] + ' on ' + s);
li.appendChild(img);
} else {
var salt = pce.getAttribute('alt');
salt = salt.substring(0, salt.length-2) + s;
pce.setAttribute('alt', salt);
var srci = pce.parentNode.innerHTML; // Duplicate.
pce.parentNode.innerHTML = ''; // Remove.
li.innerHTML = srci; // Add.
}
}
}
postG();
}

function postG () {
var drag;
var drop;
for (var b=0; C('coord').length > b; b++) {
C('coord')[b].onmousedown = function () {event.preventDefault(); drag = this.id}
C('coord')[b].onmouseup = function () {drop = this.id; if (drag.length === 2 && drop.length === 2) {dragAndDrop(drag, drop)}} // Shouldn't rely on legal input here.
}
}