/* © Anatol Latotin, latotin.com */

function ch(n)
{
	var disp = document.getElementById("i"+n).style.display;
	document.getElementById("i"+n).style.display = (disp == "none" ? "block" : "none" );
	
	setTimeout( "ch("+n+")", Math.round(100 + Math.random()*600) );
}

for(i = 1; i <= 11; i++)
{
	ch(i);
}