function initRollOverImages() {
  var image_cache = new Object();
  $("img.over").each(function(i) {
    var imgsrc = this.src;
    var dot = this.src.lastIndexOf('.');
    var imgsrc_on = this.src.substr(0, dot) + '_o' + this.src.substr(dot, 4);
    image_cache[this.src] = new Image();
    image_cache[this.src].src = imgsrc_on;
    $(this).hover(
      function() { this.src = imgsrc_on; },
      function() { this.src = imgsrc; });
  });
}

$(document).ready(initRollOverImages);

function initialize() { 
      if (GBrowserIsCompatible()) { 
        var map = new GMap2(document.getElementById("map_canvas")); 
        map.setCenter(new GLatLng(34.700758,135.445634), 17); 
		var marker = new GMarker(new GLatLng(34.700758,135.445634));
		map.addOverlay(marker);
		map.addControl(new GLargeMapControl());
		var miniMap=new GOverviewMapControl(new GSize(200,150));map.addControl(miniMap);
		map.addControl(new GMapTypeControl());
      } 
    }