/*** adding sf-vertical in addition to main_navigation creates a vertical menu ***/
#main_navigation, #main_navigation li {
	width:	160px;
}
/* this lacks ul at the start of the selector, so the styles from the main CSS file override it where needed */
#main_navigation li:hover ul,
#main_navigation li.sfHover ul {
	left:	160px; /* match ul width */
	top:	0;
}

/*** alter arrow directions ***/
#main_navigation .sf-sub-indicator { background-position: -10px 0; } /*

/* hover arrow direction for modern browsers*/
#main_navigation a:focus,
#main_navigation a:hover,
#main_navigation a:active,
#main_navigation li:hover > a,
#main_navigation li.sfHover > a {
	background-position: -10px 0; /* arrow hovers for modern browsers*/
}