var ZIPPED_URL = "http://www.stuxum.de/guxcom_tool/graphic/zipped_triangle.gif";
  var UNZIPPED_URL = "http://www.stuxum.de/guxcom_tool/graphic/unzipped_triangle.gif"

  function dropInfo(blockId, otherId, opt_image, opt_otherImage, opt_callback) 
  {
    var blockNode = document.getElementById(blockId);
    if (blockNode.style.display == 'block')
		{
	      blockNode.style.display = 'none';
    	  if (opt_image)
		  {
	      opt_image.src = ZIPPED_URL;
      	  }
	      if (opt_callback) 
		  {
	      opt_callback(blockId, false);
	      }
    	} 
		else 
		{
	    blockNode.style.display='block';
	    if (opt_image)
			{
	        opt_image.src = UNZIPPED_URL;
    		}

      var otherNode = document.getElementById(otherId);
      if (otherId != 'none')
	  	{
        if (otherNode.style.display == 'block') 
			{
            otherNode.style.display = 'none';
     	     if (opt_otherImage) 
			 	{
	            opt_otherImage.src = ZIPPED_URL;
     		    }
			}
	     }
      if (opt_callback) 
	  	 {
	     opt_callback(blockId, true);
    	 }
	 }
  }