http://www.ipdctest.com/SpryAssets/SpryMenuBarVertical.css
It's the background image in these two CSS rules
ul.MenuBarVertical a.MenuBarItemSubmenu
{
background-image: url(SpryMenuBarRight.gif);
background-repeat: no-repeat;
background-position: 95% 50%;
}
/* Menu items that are open with submenus have the class designation MenuBarItemSubmenuHover and are set to use a "hover" background image positioned on the far left (95%) and centered vertically (50%) */
ul.MenuBarVertical a.MenuBarItemSubmenuHover
{
background-image: url(SpryMenuBarRightHover.gif);
background-repeat: no-repeat;
background-position: 95% 50%;
}
PS the path to your SpryAssets folder is wrong in the page code.
Page code:
<script src="../../SpryAssets/SpryMenuBar.js" type="text/javascript"></script>
<link href="../../SpryAssets/SpryMenuBarVertical.css" rel="stylesheet" type="text/css" />
Should be
<script src="/SpryAssets/SpryMenuBar.js" type="text/javascript"></script>
<link href="/SpryAssets/SpryMenuBarVertical.css" rel="stylesheet" type="text/css" />
