Google Map Marker Icon

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C#

ASP.NET

Hello
I have found a script that enables me to display a Google map with marker icons. My problem is I need to depending on the information I receive from the database i need to display a different icon. I am trying to call the marker icon from the code behind in asp.net SO far I have been able to get the popup tom work but to change the static icon I have had no luck.
Both code pages are below any help would be appreciated.

Function I am trying to call is

function createMarker(point, html, StartEnd) {
    var markerImage
    var markerIcon = new GIcon(G_DEFAULT_ICON);
    markerIcon.image = markerImage;
    markerIcon.iconSize = new GSize(50, 50);
    markerIcon.iconAnchor = new GPoint(25, 25);
    var marker;
    if (StartEnd == "true") {
        marker = new GMarker(point, { icon: markerIcon });
    }
    else {
        marker = new GMarker(point);
    }
    GEvent.addListener(marker, "click", function() {
        marker.openInfoWindowHtml(html);
    });
    return marker;
}

this is the aspx.cs file

StringBuilder sbx = new StringBuilder();
              sbx.Append("<script language=javascript>      createMarker() { var markerIcon = []; ");
              sbx.Append("Image markerImage = new Image()");
              //markerIcon.
              sbx.Append("ImageUrl = ~/Images/AirplaneIcon.gif");
              sbx.Append("}</script>");
              Page.RegisterStartupScript("createMarker", sbx.ToString());