var b1 = new Image();
b1.src = "dateien/tri.gif";
	
function swap(dat1,dat2){
	document.images[dat1].src = dat2;
	return true;
};

  function ShowPic(picname,w,h) {
	var newWidth, newHeight, newX,newY,params;
	var ie_running = (document.all);
	params = "";
	newWidth = screen.availWidth;
	newHeight = screen.availHeight;
	if (newWidth>w) newWidth=w;
	if (newHeight>h) newHeight=h;
	newX = (screen.availWidth - newWidth)/2;
	newY = (screen.availHeight - newHeight)/2;
	if (newX<0) newX=0;
	if (newY<0) newY=0;
	params = "width=" + newWidth + ",height=" + newHeight + "resizeable=yes,scrollbars=yes"
	if (ie_running)
		params = params + ",left=" + newX + ",top=" + newY;
	else
		params = params + ",screenX=" + newX + ",screenY=" + newY;

	window.open(picname, "foto", params);
  }