diff --git a/jquery.dnd_page_scroll.js b/jquery.dnd_page_scroll.js
index fc38f3e..22e2f2e 100644
--- a/jquery.dnd_page_scroll.js
+++ b/jquery.dnd_page_scroll.js
@@ -11,19 +11,20 @@
 			topId: 'top_scroll_page',
 			bottomId: 'bottom_scroll_page',
 			delay: 50,
-			height: 20
+			height: 20,
+			scrollBy: 50,
 		};
 		var options = $.extend(defaults, options);
 		
 		var top_el = $('#'+options.topId);
 		if (!top_el.length)
-			top_el = $('<div id="top_scroll_page">&nbsp;</div>').appendTo('body');
+			top_el = $('<div id="'+options.topId+'">&nbsp;</div>').appendTo('body');
 		
 		var bottom_el = $('#'+options.bottomId);
 		if (!bottom_el.length)
-			bottom_el = $('<div id="bottom_scroll_page">&nbsp;</div>').appendTo('body');
+			bottom_el = $('<div id="'+options.bottomId+'">&nbsp;</div>').appendTo('body');
 			
-		var both_el = $('#top_scroll_page, #bottom_scroll_page');
+		var both_el = $('#'+options.topId+', #'+options.bottomId);
 		both_el.hide();
 		both_el.css({
 			//backgroundColor: '#FFE698', 
@@ -52,7 +53,7 @@
 			//console.log('dragover '+direction+' last='+last+' current='+current);
 			
 			if (last != undefined && last == current && current > 0) {
-				var newScrollTop = scrollTop+direction*50;
+				var newScrollTop = scrollTop+direction*options.scrollBy;
 				//console.log('scrolling '+newScrollTop);
 				$('html,body').animate(
 					{scrollTop: newScrollTop},