javascript - different colors for different routes on google maps importing multiple KML files build in google engine? -

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i loading multiple kml layers files google maps. becomes difficult read since different bus routes on map. possible have them in different colors example kml1 file in red , kml2 file in blue etc. used google engine build these kml files did not option use different colors on line/markers. 

function initialize() {   var abby = new google.maps.latlng(49.051078,-122.314221);   var mapoptions = {     zoom: 11,     center: abby   }    map = new google.maps.map(document.getelementbyid('map-canvas'), mapoptions);    var ctalayer = new google.maps.kmllayer({     url:'https://dl.dropboxusercontent.com/u/143598220/1.%20blueridge-mckee%20goline.kml'   });    var ctalayer2 = new google.maps.kmllayer({     url:'https://dl.dropboxusercontent.com/u/143598220/2.%20bluejay-huntingdon%20goline.kml'   });  var ctalayer3 = new google.maps.kmllayer({     url:'https://dl.dropboxusercontent.com/u/143598220/3.%20clearbrook%20-%20ufv%20goline.kml'   });    ctalayer.setmap(map);   ctalayer2.setmap(map);   ctalayer3.setmap(map);    if(navigator.geolocation) {     navigator.geolocation.getcurrentposition(function(position) {       var pos = new google.maps.latlng(position.coords.latitude,                                        position.coords.longitude);        var infowindow = new google.maps.infowindow({         map: map,         position: pos,         disableautopan: true       });      marker=new google.maps.marker({   position:pos,   animation:google.maps.animation.bounce,         disableautopan: true    });   marker.setmap(map);  var infowindow2 = new google.maps.infowindow({   content:"your current location!"   });  google.maps.event.addlistener(marker, 'click', function() {   infowindow2.open(map,marker);   });     //   map.setcenter(pos);      }, function() {       handlenogeolocation(true);     });   } else {     // browser doesn't support geolocation     handlenogeolocation(false);   } }  function handlenogeolocation(errorflag) {   if (errorflag) {     var content = 'error: geolocation service failed.';   } else {     var content = 'error: browser doesn\'t support geolocation.';   }    var options = {     map: map,     position: new google.maps.latlng(60, 105),     content: content   };      var infowindow = new google.maps.infowindow(options);   map.setcenter(options.position);   }    google.maps.event.adddomlistener(window, 'load', initialize);


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