function menu_act (id) {
	id.style.background='url(pics/bg_menu_act.gif) repeat-x top left';
}
function menu_noact (id) {
	id.style.background='transparent';
}

nn4 = (document.layers) ? true : false;
ie4 = (document.all) ? true : false;
dom = (document.createTextNode)? true : false;

function popupWindow(fileUrl, winN, winWidth, winHeight, scrollB) {
	var winName = (winN)? winN : 'popupWin'
	var scrollBars = (scrollB)? scrollB : 'auto'
	if (nn4 || ie4 || dom) {
		if (screen.width < winWidth + 50) { winWidth = screen.width - 50; scrollbars = 'yes' }
		if (screen.height < winHeight + 100) { winHeight = screen.height - 100; scrollbars = 'yes' }
		posX = Math.round((screen.width - winWidth) / 2);
		posY = Math.round((screen.height - winHeight) / 2);
		posCode = (nn4)? "screenX="+posX+",screenY="+posY : "left="+posX+",top="+posY;
	} else {
		posCode = "";
	}
	var popupWin = window.open(fileUrl, winName,"menubar=no, toolbar=no, scrollbars="+scrollB+", status=yes, resizable=no, width=" + winWidth + ", height=" + winHeight + " ," + posCode);
	if (popupWin) popupWin.focus();
}