var pn = 0;
var stopped = false;


function pr() {
if(stopped == true)
	return;
var el = document.getElementById("centerimage");
el.style.cursor = "pointer";
pn++;
if(pn > 4)
	pn = 1;
el.src = pn + ".jpg";
el.title = " click to stop slides ";
}

function sl() {
	if(stopped == false) {
		stopped = true;
		document.getElementById("centerimage").title = " click to start slides ";
	}
	else {
		stopped = false;
		pr();
	}
}