If you really don't want to convert your text into XML, then I suggest
you start like this:
Grab the XML example code from my tutorial
http://www.econym.demon.co.uk/googlemaps/basic3.htm
Then make the following changes to the XML processing bit to convert it
to text processing:
* use request.responseText instead of request.responseXML
* rip out all the getElementsBtTagName and getAttribue stuff and replace
it with the string.split() method:
var gpsDoc = request.responseText;
// Split it on 'newline' into an array of lines
var markers = gpsDoc.split('\n');
// Loop through the lines
for (var i = 0; i < markers.length; i++) {
// If empty don't process
if (!markers[i]){break}
// Split each line on ':' into an array of parts
var part = markers[i].split(':');
// Grab the parts
var date = part[0];
var name = part[1];
var lng = parseFloat(part[2]);
var lat = parseFloat(part[3]);
var marker = new GMarker(new GPoint(lng,lat));
map.addOverlay(marker);
}