var curr = 0;
var maxCurr = 3;
var flash = null;

document.addEvent('domready', function() {
	curr = Math.floor(Math.random()* 4);

	flash = [$('flash-1'), $('flash-2'), $('flash-3'), $('flash-4'), $('flash-5'), $('flash-6'), $('flash-7')];	
	flash[curr].setStyle('opacity', 0).fade('in').setStyle('display', 'block');
	
	refShowNext.periodical(9000);
});

var refShowNext = function() {
	flash[curr].setStyle('display', 'none');
	increaseCurr();
	flash[curr].setStyle('opacity', 0).fade('in').setStyle('display', 'block');
}

function increaseCurr() {
	if (curr == flash.length-1)
		curr = 0;
	else
		curr++;
}