diff --git a/src/agenda/AgendaEventRenderer.js b/src/agenda/AgendaEventRenderer.js
index 717c40a..8e8ddf6 100644
--- a/src/agenda/AgendaEventRenderer.js
+++ b/src/agenda/AgendaEventRenderer.js
@@ -269,8 +269,9 @@ function AgendaEventRenderer() {
 		for (i=0; i<segCnt; i++) {
 			seg = segs[i];
 			if (eventElement = seg.element) {
-				eventElement[0].style.width = seg.outerWidth - seg.hsides + 'px';
-				eventElement[0].style.height = (height = seg.outerHeight - seg.vsides) + 'px';
+				eventElement[0].style.width = Math.max(0, seg.outerWidth - seg.hsides) + 'px';
+				height = Math.max(0, seg.outerHeight - seg.vsides);
+				eventElement[0].style.height = height + 'px';
 				event = seg.event;
 				if (seg.titleTop !== undefined && height - seg.titleTop < 10) {
 					// not enough room for title, put it in the time header
diff --git a/src/common/DayEventRenderer.js b/src/common/DayEventRenderer.js
index 75eac0a..61ce7f0 100644
--- a/src/common/DayEventRenderer.js
+++ b/src/common/DayEventRenderer.js
@@ -144,7 +144,7 @@ function DayEventRenderer() {
 		for (i=0; i<segCnt; i++) {
 			seg = segs[i];
 			if (eventElement = seg.element) {
-				eventElement[0].style.width = seg.outerWidth - seg.hsides + 'px';
+				eventElement[0].style.width = Math.max(0, seg.outerWidth - seg.hsides) + 'px';
 			}
 		}
 	
diff --git a/src/common/util.js b/src/common/util.js
index 3c29870..99abb9a 100644
--- a/src/common/util.js
+++ b/src/common/util.js
@@ -139,14 +139,14 @@ function lazySegBind(container, segs, bindHandlers) {
 
 function setOuterWidth(element, width, includeMargins) {
 	element.each(function(i, _element) {
-		_element.style.width = width - hsides(_element, includeMargins) + 'px';
+		_element.style.width = Math.max(0, width - hsides(_element, includeMargins)) + 'px';
 	});
 }
 
 
 function setOuterHeight(element, height, includeMargins) {
 	element.each(function(i, _element) {
-		_element.style.height = height - vsides(_element, includeMargins) + 'px';
+		_element.style.height = Math.max(0, height - vsides(_element, includeMargins)) + 'px';
 	});
 }
 
diff --git a/tests/issue_517_js_error_ie.html b/tests/issue_517_js_error_ie.html
new file mode 100644
index 0000000..d759a2e
--- /dev/null
+++ b/tests/issue_517_js_error_ie.html
@@ -0,0 +1,127 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN""http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
+<html>
+<head>
+<script type='text/javascript' src='../src/_loader.js?debug'></script>
+<script type='text/javascript'>
+
+	$(document).ready(function() {
+	
+		var date = new Date();
+		var d = date.getDate();
+		var m = date.getMonth();
+		var y = date.getFullYear();
+		
+		$('#calendar').fullCalendar({
+			header: {
+				left: 'prev,next today',
+				center: 'title',
+				right: 'month,agendaWeek,basicWeek,agendaDay,basicDay'
+			},
+			defaultView: 'agendaWeek',
+			events: [
+					{
+						title: 'Event1',
+						start: new Date(y, m, d, 6, 0), 
+						allDay : false
+					},
+					{
+						title: 'Event2',
+						start: new Date(y, m, d, 6, 0), 
+						allDay : false
+					},
+					{
+						title: 'Event3',
+						start: new Date(y, m, d, 6, 0), 
+						allDay : false
+					},
+					{
+						title: 'Event4',
+						start: new Date(y, m, d, 6, 0), 
+						allDay : false
+					},
+					{
+						title: 'Event5',
+						start: new Date(y, m, d, 6, 0), 
+						allDay : false
+					},
+					{
+						title: 'Event6',
+						start: new Date(y, m, d, 6, 0), 
+						allDay : false
+					},
+					{
+						title: 'Event7',
+						start: new Date(y, m, d, 6, 0), 
+						allDay : false
+					},
+					{
+						title: 'Event8',
+						start: new Date(y, m, d, 6, 0), 
+						allDay : false
+					}, 
+					{
+						title: 'Event9',
+						start: new Date(y, m, d, 6, 0), 
+						allDay : false
+					},
+					{
+						title: 'Event10',
+						start: new Date(y, m, d, 6, 0), 
+						allDay : false
+					},
+					{
+						title: 'Event11',
+						start: new Date(y, m, d, 6, 0), 
+						allDay : false
+					},
+					{
+						title: 'Event12',
+						start: new Date(y, m, d, 6, 0), 
+						allDay : false
+					},
+					{
+						title: 'Event13',
+						start: new Date(y, m, d, 6, 0), 
+						allDay : false
+					},
+					{
+						title: 'Event14',
+						start: new Date(y, m, d, 6, 0), 
+						allDay : false
+					},
+					{
+						title: 'Event15',
+						start: new Date(y, m, d, 6, 0), 
+						allDay : false
+					},
+					{
+						title: 'Event16',
+						start: new Date(y, m, d, 6, 0), 
+						allDay : false
+					}
+			]
+		});
+		
+	});
+
+</script>
+<style type='text/css'>
+
+	body {
+		margin-top: 40px;
+		text-align: center;
+		font-size: 13px;
+		font-family: "Lucida Grande",Helvetica,Arial,Verdana,sans-serif;
+		}
+
+	#calendar {
+		width: 400px;
+		margin: 0 auto;
+		}
+
+</style>
+</head>
+<body>
+<div id='calendar'></div>
+</body>
+</html>
