anchor.diff:  	var numberStarsystems_x;
   	var numberStarsystems_y;
   	
  +	var graphics = new Object();
  +	var numGraphics = 0;
  +	
   	// public
   	
   	return {
  +		addGraphic: function(dims){
  +			$('<div id="' + dims +'"></div>').appendTo('body');
  +			graphics[dims] = new jsGraphics(dims);
  +			++numGraphics;
  +			$(dims).hide();
  +		},
  +		graphicsInvisible: function(){
  +			for(var dims in graphics) {
  +				$(dims).hide();
  +			}
  +		},
  +		getGraphic: function(dims){
  +			return graphics[dims];
  +		},
   		testSmallestU: function(u_dim){
   			min_u = Math.min(u_dim, min_u);
   			current_u = min_u;
  
positive.code: 
  var drawSystems = (function(){
  	// private
  	function isSystemOnPage(systemObject){
  		var uDelta = pageSpace.currentU() + pageSpace.getNumberStarSystemsX();
  		var vDelta = pageSpace.currentV() + pageSpace.getNumberStarSystemsY();
  
negative.code: 		},
  		getNumberStarSystemsY: function(){
  			return parseInt(numberStarsystems_y);
  		},
  		getNumberGraphics: function(){
  			return parseInt(numGraphics);
  		}
  		
  	};
  