Edit in JSFiddle

var elevator,
    map,
    polyline,
    crowders = new google.maps.LatLng(35.2083, -81.3108),
    spencer = new google.maps.LatLng(35.2582, -81.1137),
    charlotte = new google.maps.LatLng(35.2302, -80.8528);

$(window).load(function() {
    var myOptions = {
        zoom: 10,
        center: spencer,
          mapTypeId: 'terrain'
    };

    map = new google.maps.Map(document.getElementById("map_canvas"), myOptions);
    elevator = new google.maps.ElevationService();

    drawPath();
    
});

function drawPath() {
    var path = [ crowders, spencer, charlotte ],
        pathRequest = {
            'path': path,
            'samples': 100
        };
    elevator.getElevationAlongPath(pathRequest, plotElevation);
}


function plotElevation(results, status) {
    if (status == google.maps.ElevationStatus.OK) {

        var elevations = results,
            eleIcons = [],
            elevationPath = [];

        // The magic beans
        for (var i = 0; i < results.length; i++) {
            elevationPath.push(elevations[i].location);
           var theIcon = {
                path: 'M 0,1 0,' + (elevations[i].elevation * 0.10),
                strokeColor: "red",
                rotation: 180,
                strokeWeight: 4,
                strokeOpacity: 0.8,
                scale: 1
            };
            var theShadow = {
                path: 'M 0,6 0,' + (elevations[i].elevation * 0.05),
                strokeColor: "#000000",
                rotation: 330,
                strokeWeight: 8,
                strokeOpacity: 0.2,
                scale: 1
            };
            eleIcons.push({ icon: theShadow, offset: i + "%" });
            eleIcons.push({ icon: theIcon, offset: i + "%" });
        }

        var pathOptions = {
            path: elevationPath,
            strokeColor: '#0000CC',
            strokeWeight: 5,
            icons: eleIcons,
            map: map
        };
        
        polyline = new google.maps.Polyline(pathOptions);

    }
}

<script src="http://maps.googleapis.com/maps/api/js?sensor=true"></script>
<div id="map_canvas"></div>

#map_canvas {  width:640px; height:400px; border: 1px solid black; }