<svg  xmlns:xlink="http://www.w3.org/1999/xlink" xmlns="http://www.w3.org/2000/svg" >
     <defs>
          <marker id="Triangle"
            viewBox="0 0 10 10" refX="4" refY="5"
            markerUnits="strokeWidth"
            markerWidth="4" markerHeight="3"
            style="stroke:#FF9933;"
            orient="auto">
            <path d="M 0 0 L 10 5 L 0 10 z" />
            </marker>
     </defs>
     <line id="migrationPath" x1="0" x2="80" y1="0" y2="80" style="background-color:transparent;z-index:2;fill:none;stroke:#FF9933;stroke-width:5;" marker-end="url(#Triangle)"/>

</svg>
Make the migration arrow smaller
Make the migration arrow smaller

http://code.google.com/p/fbug/source/detail?r=5982
