diff --git a/app/assets/javascripts/orbit-1.0.js b/app/assets/javascripts/orbit-1.0.js
index cbb6e0b8..d91e3533 100644
--- a/app/assets/javascripts/orbit-1.0.js
+++ b/app/assets/javascripts/orbit-1.0.js
@@ -99,7 +99,11 @@ function mainTablePosition() {
 	var $height = $('#main-wrap > .subnav').height()
 	var $table = $('#main-wrap > .table')
 	//alert ($table.height())
-	$table.stop().animate({marginTop:$height-17},500)
+	$height = $height-17;
+	if($height<0){
+		$height = 0;
+	}
+	$table.stop().animate({marginTop:$height},500)
 	//$table.css({marginTop : $height})
 }
 $(window).scroll(function () {