function m_over(obj) {
	obj.style.backgroundPosition = "0 11px";
}
function m_out(obj) {
	obj.style.backgroundPosition = "0 0";
}
function sm_over(obj) {
	obj.style.backgroundPosition = "0 18px";
}
function sm_out(obj) {
	obj.style.backgroundPosition = "0 0";
}