Script to show results on http://www.alle-immobilien.ch/ on a map. Takes a while to load the locations (limitation google maps api). Copy paste all the code into the javascript console and enjoy.

showmap.js

// we can use jquery since site has it added
// 1. add header
document.oldWrite = document.write;
document.write = function(text) {
  var parser = new DOMParser();
  var element = parser.parseFromString(text, "text/xml");
  var child = element.firstChild;
  var element = document.createElement("script");
  element.src = child.getAttribute('src');
  element.type= "text/javascript";
  document.getElementsByTagName("head")[0].appendChild(element);
  document.write = document.oldWrite;
};
var element = document.createElement("script");
element.src = "https://maps.googleapis.com/maps/api/js?key=AIzaSyAJ9eMeQCAhkFlbmVPdmgwO0Y5ECgVV-FA&sensor=true";
element.type= "text/javascript";
document.getElementsByTagName("head")[0].appendChild(element); 

// 2. add div(map) element
$('<div id="map-canvas" style="height: 400px; width: 100%;"/>').insertAfter('#resultPanel');

// 3. setup map
var map;
function initMap() {
  var mapOptions = {
    center: new google.maps.LatLng(47.4235585, 9.3770272),
    zoom: 15,
    mapTypeId: google.maps.MapTypeId.ROADMAP
  };
  map = new google.maps.Map(document.getElementById("map-canvas"),
      mapOptions);
}

function showMarkers() {
  // 4. extract addresses
  var streets = [];
  var geocoder = new google.maps.Geocoder();
  $('#resultList .row').each(function(item){
    var title = $(this).find('h2').text();
    var street = $(this).find('.cell2').text().split('\n')[0];
    var info = $(this).find('.cell3 a').html();
    var link = 'http://www.alle-immobilien.ch/' + $(this).find('a').attr('href');
    streets.push({street: street, link: link, title: title, info: info});
  });

  // 4.1 lookup
  var current = 0;
  function resolve() {
    if (current > streets.length - 1) {
      resolveDone();
      return;
    }
    var item = streets[current];
    geocoder.geocode( { 'address': item.street + ', St. Gallen, Switzerland', 'region': 'ch' }, function(results, status) {
      if (status == google.maps.GeocoderStatus.OK) {
        item.location = results[0].geometry.location;
      } else {
        console.log("Unable to find address: " + status);
      }

      current++;
      setTimeout(resolve, 1000);
      showMarker(item);
    });
  }
  function resolveDone() {
    alert('Loading markers done');
  }
  resolve();
}

// 5. show markers of addresses
function showMarker(item) {
  var marker = new google.maps.Marker({
    position: item.location,
    map: map,
    title:"Wohnung"
  });
  var contentString = '<div id="content">'
    +   '<h2>' + item.title + '</h2>'
    +   '<div>' + item.info + '</div>'
    +   '<a href="' + item.link + '" target="_blank">Link</a>'
    + '</div>';
  var infowindow = new google.maps.InfoWindow({ content: contentString });
  google.maps.event.addListener(marker, 'click', function() {
    infowindow.open(map,marker);
  });
}


setTimeout(initMap, 1000);
setTimeout(showMarkers, 1200);