speed = 80;
j = new Array();
j['arrow1'] = 0;
j['arrow2'] = 0;
j['arrow3'] = 0;
j['arrow4'] = 0;
j['arrow5'] = 0;
j['arrow6'] = 0;
j['arrow7'] = 0;

slidingUp = new Array();
slidingUp['arrow1'] = 0;
slidingUp['arrow2'] = 0;
slidingUp['arrow3'] = 0;
slidingUp['arrow4'] = 0;
slidingUp['arrow5'] = 0;
slidingUp['arrow6'] = 0;
slidingUp['arrow7'] = 0;

slidingDown = new Array();

function slide(i,num) {
	k = -(num * 60);
	obj = document.getElementById(i);
	obj.style.top = k+"px";
}

function startSlideUp(i) {
	slidingUp[i] = 1;
	slidingDown[i] = 0;
	slideUp(i);
}

function startSlideDown(i) {
	slidingDown[i] = 1;
	slidingUp[i] = 0;
	slideDown(i);
}

function slideUp(i) {
	if (! slidingDown[i]) {
		if (j[i] < 8) {
			slide(i,j[i]);
			if (j[i] < 7) {
				j[i] = j[i] + 1;
				setTimeout("slideUp('" + i + "')",speed);
			}
		}
	}
}

function slideDown(i) {
	if (! slidingUp[i]) {
		if (j[i] > -1) {
			slide(i,j[i]);
			if (j[i] > 0) {
				j[i] = j[i] - 1;
				setTimeout("slideDown('" + i + "')",speed);
			}
		}
	}
}