var SAMPLE_POST = HOST_URL + '/staticmap/v3/getmap?key=YOUR_KEY_HERE&size=400,200&zoom=7&center=40.0378,-76.305801';

function showBasicURL() {
    var safe = SAMPLE_POST;
    document.getElementById('basicSampleUrl').innerHTML = safe.replace(/</g, '&lt;').replace(/>/g, '&gt;');;
};

function doClick() {
    var newURL = SAMPLE_POST.replace('YOUR_KEY_HERE', 'Dmjtd%7Clu612007nq%2C20%3Do5-50zah');
    document.getElementById('basicImage').innerHTML = '<img src="' + newURL + '"/>';
};