var menu_itm =  4;
var menu_tgt =  0;
var menu_ntg =  0;
var menu_spd =  0;
var menu_tpx = 0;


function menuon(Num) {

	if (menu_tgt == 0) {
		document.layers['menu'+Num+'_lyr'].moveAbove(document.layers['menu1txt_lyr']);
		document.layers['line_lyr'].visibility = 'visible';
		menu_tpx = 31 - menu_tpx;
		menu_spd = Math.ceil(menu_tpx*3/5);
		menu_tgt = Num;
	} else {
		menu_ntg = Num;
	}

}


function menuoff() {

	menu_ntg = 0;
	if (menu_tgt > 0) {
		document.layers['menu'+menu_tgt+'txt_lyr'].visibility = 'hidden';
		document.layers['menu'+menu_tgt+'_lyr'].moveBelow(document.layers['menu1txt_lyr']);
		menu_tpx = 31 - menu_tpx;
		menu_spd = Math.ceil(menu_tpx*3/5);
		menu_tgt = -menu_tgt;
	}

}


function menuloop() {

	if (menu_tgt > 0) {

		if (menu_tpx > 0) {
			for (i = 1; i <= menu_itm; i++) {
				document.layers['menu'+i+'_lyr'].moveBy((menu_tgt - i)*menu_spd,0);
			}
			document.layers['bg2_lyr'].clip.left -= menu_spd*(menu_itm - menu_tgt + 4);
			document.layers['line_lyr'].moveBy((menu_tgt - menu_itm)*menu_spd,0);
			menu_tpx -= menu_spd;
			menu_spd = Math.ceil(menu_spd/3);
		} else {
			document.layers['menu'+menu_tgt+'txt_lyr'].visibility = 'visible';
		}

	}

	if (menu_tgt < 0) {

		if (menu_tpx > 0) {
			for (i = 1; i <= menu_itm; i++) {
				document.layers['menu'+i+'_lyr'].moveBy((menu_tgt + i)*menu_spd,0);
			}
			document.layers['bg2_lyr'].clip.left += menu_spd*(menu_itm + menu_tgt + 4);
			document.layers['line_lyr'].moveBy((menu_tgt + menu_itm)*menu_spd,0);
			menu_tpx -= menu_spd;
			menu_spd = Math.ceil(menu_spd/3);
		} else if (menu_ntg != 0) {
			menu_tgt = 0;
			menuon(menu_ntg);
			menu_ntg = 0;
		} else {
			document.layers['line_lyr'].visibility = 'hidden';
			menu_tgt = 0;
		}

	}

}