function nbInitVars() {
	nbPosition = new Array (0,0,0,0);
	nbSpeed = new Array (0,0,0,0);
	nbAccel = new Array (0,0,0,0);
	nbHidden = new Array (true,true,true,true);
	nbOpen = new Array (false,false,false,false);
	nbTimeout = new Array (0,0,0,0)
}
function nbTrace() {
	for (i=0; i<4; i++) {
		if ((!nbHidden[i]) && (!nbOpen[i])) {
			nbSpeed[i] += nbAccel[i];
			nbPosition[i] += nbSpeed[i];
			if (nbPosition[i] > 88) {
				nbOpen[i] = true;
				nbTimeout[i] = 125;
				nbSpeed[i] = 0;
				nbAccel[i] = 0;
				nbPosition[i] = 89
			};
			if (nbPosition[i] < 1) {
				nbHidden[i] = true;
				nbSpeed[i] = 0;
				nbAccel[i] = 0;
				nbPosition[i] = 0;
				document.getElementById("nb_item_" + (i + 1)).style.display = "none"
			};
			document.getElementById("nb_item_" + (i + 1)).style.top = nbPosition[i] - 59
		};
		if (nbOpen[i]) {
			nbTimeout[i]--;
			if (nbTimeout[i] == 0) {
				nbOpen[i] = false;
				nbAccel[i] = -2
			}
		}
	};
	setTimeout("nbTrace()",10)
}
function nbInit() {
	document.getElementById('nbFlash').style.visibility = 'visible';
	nbInitVars();
	nbTrace()
}
function nbOpenItem(idNum) {
	
		
	for (i=0; i<4; i++) {
		if (!nbHidden[i]) {
			nbAccel[i] = -2;
			nbOpen[i] = false
		}
	};
	nbAccel[idNum-1] = 2;
	nbHidden[idNum-1] = false;
	
	document.getElementById("nb_item_" + idNum).style.display = "block"
		
}