function checkImageDisplay(id){
	var img = document.getElementById(id);
	if (id.substring(id.length-2) == ".5"){
		if (img.width > 1){
			var neighborId = id.substring(0, id.length-2);
			var neighbor = document.getElementById(neighborId);
			neighbor.parentNode.style.width="81px";
			img.parentNode.style.display="inline";
		} else {
			var neighborId = id.substring(0, id.length-2);
			var neighbor = document.getElementById(neighborId);
			neighbor.parentNode.style.width="163px";
			img.parentNode.style.display="none";
		}
	} else {
		if (img.width > 100){
			document.getElementById(id + ".5").src="/fileadmin/images/1x1.png";
		} else {
			var idx = id.substring(id.length -1 );
			document.getElementById(id + ".5").src="/random.php?idx=" + idx + ".5&neighbor=" + img.src;
		}
	}
}