function printWindow()
{
    window.print();
}

window.guidingprinciples = new Array();

function addGuidingPrinciple(header, body)
{
    if (header != '' && body != '') {
        var guidingprinciple = new Object;

        guidingprinciple.header = header;
        guidingprinciple.body = body;
        window.guidingprinciples.push(guidingprinciple);
    }
}

function setRandomGuidingPrinciple()
{
    var guidingprinciple_div = document.getElementById('guiding-principle');
    if (guidingprinciple_div && (window.guidingprinciples.length > 0)) {
        var luckyKey = Math.round(Math.random()*(window.guidingprinciples.length-1));
        var principle = window.guidingprinciples[luckyKey];

        // create header
        var h4 = document.createElement('h4');
        addTextNode(h4, principle.header);
        // create body
        var p = document.createElement('p');
        addTextNode(p, principle.body);

        if (h4 != '' && p != '') {
            guidingprinciple_div.appendChild(h4);
            guidingprinciple_div.appendChild(p);
        }
    }
}

/**
 * Adds text node to node
 */
function addTextNode(node, text)
{
    var txt = document.createTextNode(text);
    node.appendChild(txt);
    return txt;
}