// Create a base icon for all of our markers that specifies the shadow, icon dimensions, etc.
 //Original Icon
 var redIcon = new GIcon();
 redIcon.image = "http://www.google.com/mapfiles/marker.png";
 redIcon.shadow = "http://www.google.com/mapfiles/shadow50.png";
 redIcon.iconSize = new GSize(20, 34);
 redIcon.shadowSize = new GSize(37, 34);
 redIcon.iconAnchor = new GPoint(9, 34);
 redIcon.infoWindowAnchor = new GPoint(9, 2);
 redIcon.infoShadowAnchor = new GPoint(18, 25); 
 
 //Blue Icon
 var blueIcon = new GIcon();
 blueIcon.image = "http://www.trailcentral.com/gps/images/gps_blue_marker.png";
 blueIcon.shadow = "http://www.google.com/mapfiles/shadow50.png";
 blueIcon.iconSize = new GSize(20, 34);
 blueIcon.shadowSize = new GSize(37, 34);
 blueIcon.iconAnchor = new GPoint(9, 34);
 blueIcon.infoWindowAnchor = new GPoint(9, 2);
 blueIcon.infoShadowAnchor = new GPoint(18, 25);
 
 //Green Icon
 var greenIcon = new GIcon();
 greenIcon.image = "http://www.trailcentral.com/gps/images/gps_green_marker.png";
 greenIcon.shadow = "http://www.google.com/mapfiles/shadow50.png";
 greenIcon.iconSize = new GSize(20, 34);
 greenIcon.shadowSize = new GSize(37, 34);
 greenIcon.iconAnchor = new GPoint(9, 34);
 greenIcon.infoWindowAnchor = new GPoint(9, 2);
 greenIcon.infoShadowAnchor = new GPoint(18, 25);
 
 //Purple Icon
 var purpleIcon = new GIcon();
 purpleIcon.image = "http://www.trailcentral.com/gps/images/gps_purple_marker.png";
 purpleIcon.shadow = "http://www.google.com/mapfiles/shadow50.png";
 purpleIcon.iconSize = new GSize(20, 34);
 purpleIcon.shadowSize = new GSize(37, 34);
 purpleIcon.iconAnchor = new GPoint(9, 34);
 purpleIcon.infoWindowAnchor = new GPoint(9, 2);
 purpleIcon.infoShadowAnchor = new GPoint(18, 25);