if(document.images) {
	var navimg1 = new Array(3);
	var navimg2 = new Array(3);
	for (var i = 0; i < navimg1.length; i++)
	{
		ic = (i < 9)? '0' + (i+1): ''+(i+1); 
		navimg1[i] = new Image();
		navimg2[i] = new Image();
		navimg1[i].src = "images/aso_int_subnav_"+ic+"a.gif"
		navimg2[i].src = "images/aso_int_subnav_"+ic+"b.gif"
	}
}	
function Up(index){
	if (document.images){
		document.images['nav'+index].src = navimg2[index].src;
	}
}
function Down(index) {
	if (document.images){
		document.images['nav'+index].src = navimg1[index].src;
	}
}