anchor.diff:  		console.log("number star systems x:" + pageSpace.getNumberStarSystemsX());
   		console.log("number star systems y:" + pageSpace.getNumberStarSystemsY());
   		drawSystems.scanSystems();
  +		console.log("number graphic contexts:" + pageSpace.getNumberGraphics());
   	});
  +
  +    $("#pozV").click(function () { 
  +       pageSpace.incrementCurrentV();
  +       drawSystems.scanSystems();
  +    });
  +    $("#negV").click(function () { 
  +       pageSpace.decrementCurrentV();
  +       drawSystems.scanSystems();
  +    });
  +    $("#pozU").click(function () { 
  +       pageSpace.incrementCurrentU();
  +       drawSystems.scanSystems();
  +    });
  +    $("#negU").click(function () { 
  +       pageSpace.decrementCurrentU();
  +       drawSystems.scanSystems();
  +    });
   	
   </script>
  +
  +  
  +</div>  <!-- site -->
   </body>
   </html>
positive.code: 	var numberStarsystems_x;
  	var numberStarsystems_y;
  	
  	// public
  	
  	return {
  		testSmallestU: function(u_dim){
  			min_u = Math.min(u_dim, min_u);
  			current_u = min_u;
  
negative.code: 		},
  		getNumberStarSystemsY: function(){
  			return parseInt(numberStarsystems_y);
  		},
  		getNumberGraphics: function(){
  			return parseInt(numGraphics);
  		}
  		
  	};
  