/*various auxiliary functions*/
function getDate(offsetDay)
{
	var currentTime = new Date();
	var month = currentTime.getMonth()+1;
	var day = currentTime.getDate();
	var year = currentTime.getFullYear();
	if(offsetDay)
		day+= offsetDay;
	return day + "." + month + "." + year;
	
}

function changeImage(img_name, source)
{
	var el = document.getElementById(img_name);
	el.src = source;
}

function wopen(href, width, height) {
  w = window.open(href, "airports", "resizable=yes,scrollbars=yes,width=" + width + ",height=" + height + ",left="+Math.floor((screen.width-width)/2)+",top="+Math.floor((screen.height-height)/2));
  if(w) w.focus();
}