if (document.images)
   {
	ptWidth=10;
	ptHeight=10;
	
        photo= new Image(10,10);
        photo.src="./icons/photo.gif";
        photoempty= new Image();
        photoempty.src="./icons/photoempty.gif";
        photobig= new Image();
        photobig.src="./icons/photobig.gif";
        photobigempty= new Image();
        photobigempty.src="./icons/photobigempty.gif";

        culvert= new Image(10,10);
        culvert.src="./icons/culvert.gif";
        culvertempty= new Image(10,10);
        culvertempty.src="./icons/culvertempty.gif";
        culvertbig= new Image(10,10);
        culvertbig.src="./icons/culvertbig.gif";
        culvertbigempty= new Image(10,10);
        culvertbigempty.src="./icons/culvertbigempty.gif";

        instream= new Image(10,10);
        instream.src="./icons/instream.gif";
        instreamempty= new Image();
        instreamempty.src="./icons/instreamempty.gif";
        instreambig= new Image();
        instreambig.src="./icons/instreambig.gif";
        instreambigempty= new Image();
        instreambigempty.src="./icons/instreambigempty.gif";

        fish= new Image(10,10);
        fish.src="./icons/fish.gif";
        fishempty= new Image();
        fishempty.src="./icons/fishempty.gif";
        fishbig= new Image();
        fishbig.src="./icons/fishbig.gif";
        fishbigempty= new Image();
        fishbigempty.src="./icons/fishbigempty.gif";

        aerial= new Image(11,11);
        aerial.src="./icons/aerial.gif";
        aerialempty= new Image(10,10);
        aerialempty.src="./icons/aerialempty.gif";
        aerialbig= new Image(40,41);
        aerialbig.src="./icons/aerialbig.gif";
        aerialbigempty= new Image(40,41);
        aerialbigempty.src="./icons/aerialbigempty.gif";

        LocatorMap= new Image();
        LocatorMap.src="./maps/ludlowref.jpg";
        
        ScaleBar= new Image();
        ScaleBar.src="./icons/scale15k.gif";

        MapLocon= new Image();
        MapLocon.src="./icons/maplocon.gif";
        MapLocoff= new Image();
        MapLocoff.src="./icons/maplocoff.gif";

   }