function update_map(event)
{
	event.preventDefault();

	document.getElementById("svgcontainer").innerHTML = '<p id="loading">Generating, please wait…</p>';

	var formdata = new FormData(document.getElementById('mapinfo'));

	var request = new XMLHttpRequest();

	request.open("POST", "/render/map.svg", true);
	//request.setRequestHeader('Content-type', 'multipart/form-data');

	request.addEventListener('load', function(event) {
		if (request.status >= 200 && request.status < 300) {
			var svgblob = new Blob([request.responseText], { type: "image/svg+xml" });

			document.getElementById("svgcontainer").innerHTML = request.responseText;

			link_container = document.getElementById("downloadlink");
			link_container.innerHTML = '';

			var blobUrl = URL.createObjectURL(svgblob);

			var link = document.createElement("a"); // Or maybe get it from the current document
			link.href = blobUrl;
			link.download = "map.svg";
			link.innerHTML = "Download this map.";
			link_container.appendChild(link); // Or append it whereever you want

			//URL.revokeObjectURL(blobUrl);
		} else {
			console.warn(request.statusText, request.responseText);
		}
	});

	request.send(formdata);
}