/*alternating display of two popups*/
window.setTimeout(setPopupTimeout,7000);


function setPopupTimeout() {
	var p1 = document.getElementById('popup');
	var p2 = document.getElementById('popup2');
	var p3 = document.getElementById('popup3');
	var p4 = document.getElementById('popup4');
	var p5 = document.getElementById('popup5');
	
	if (!p1.style.display || p1.style.display!='none') {
		if (!p2.style.height) p2.style.height=(p1.offsetHeight-10) + 'px'; /*border 5 px*/
		p1.style.display='none';
		p2.style.display='';
		window.setTimeout(setPopupTimeout,7000);
	} else if (!p2.style.display || p2.style.display!='none') {
		p2.style.display='none';
		p3.style.display='';
		window.setTimeout(setPopupTimeout,5000);
	} else if (!p3.style.display || p3.style.display!='none') {
		p3.style.display='none';
		p4.style.display='';
		window.setTimeout(setPopupTimeout,5000);
	} else if (!p4.style.display || p4.style.display!='none') {
		p4.style.display='none';
		p1.style.display='';
		window.setTimeout(setPopupTimeout,5000);
	}
}
function onPopupTimeout() {
	setPopupInterval();
}