diff --git a/src/PamView/paneloverlay/overlaymark/OverlayMark.java b/src/PamView/paneloverlay/overlaymark/OverlayMark.java
index 2cadab21..5dd1439b 100644
--- a/src/PamView/paneloverlay/overlaymark/OverlayMark.java
+++ b/src/PamView/paneloverlay/overlaymark/OverlayMark.java
@@ -173,10 +173,10 @@ public class OverlayMark {
 
 		//now must find the limits of the zoom. Can be complex shapes so a bit difficult; 
 		double minX=Double.MAX_VALUE; 
-		double maxX=Double.MIN_VALUE; 
+		double maxX=Double.NEGATIVE_INFINITY; 
 
 		double minY=Double.MAX_VALUE; 
-		double maxY=Double.MIN_VALUE; 
+		double maxY=Double.NEGATIVE_INFINITY; 
 
 		//now find those maximum, and minimum values, 
 		for (int i=0; i<coordinates.size(); i++){
diff --git a/src/pamScrollSystem/PamScrollSlider.java b/src/pamScrollSystem/PamScrollSlider.java
index e0438a57..d6d36491 100644
--- a/src/pamScrollSystem/PamScrollSlider.java
+++ b/src/pamScrollSystem/PamScrollSlider.java
@@ -39,6 +39,7 @@ public class PamScrollSlider extends AbstractPamScrollerAWT {
 			panel.add(BorderLayout.CENTER, slider);
 			panel.add(BorderLayout.SOUTH, getButtonPanel());
 		}
+//		slider.setFocusable(false);
 	}
 	
 	class SliderListener implements ChangeListener {
@@ -180,5 +181,11 @@ public class PamScrollSlider extends AbstractPamScrollerAWT {
 		// TODO Auto-generated method stub
 		super.setPageStep(pageStep);
 	}
+	/**
+	 * @return the slider
+	 */
+	public JSlider getSlider() {
+		return slider;
+	}
 
 }