function info(okno,szer,wys){
	noweOkno=window.open(okno,'123','width='+szer+',height='+wys+',left='+(screen.width/2-szer/2)+',top='+(screen.height/2-wys/2)+',scrollbars=yes,resizable=yes')	
	}
	
function toggle_visibility(id) {
	var e = document.getElementById(id);
	if(e.style.display == 'none')
		e.style.display = 'block';
	else
		e.style.display = 'none';
}