diff --git a/docs/content/content-collapsible.html b/docs/content/content-collapsible.html
index 78e4123a..0a6ad70d 100755
--- a/docs/content/content-collapsible.html
+++ b/docs/content/content-collapsible.html
@@ -101,8 +101,33 @@
 			</ul>
 		</div><!-- /section 4 -->
 		
+		<h2>Nested Collapsibles</h2>
+		<div data-role="collapsible">
+			<h3>I'm a header</h3>
+			<p>I'm the collapsible content. By default I'm open and displayed on the page, but you can click the header to hide me.</p>
+			<div data-role="collapsible">
+				<h3>I'm a nested collapsible header</h3>
+				<p>I'm the collapsible content. By default I'm open and displayed on the page, but you can click the header to hide me.</p>
+			</div>
+		</div>
 		
+		<h2>Collapsible sets</h2>
+		<p>By giving a parent element a data-role of collapsible-set, you can cause other collapsibles within that parent to close whenever a new one is opened, acting like an accordion widget:</p>
 		
+		<div data-role="collapsible-set">
+			<div data-role="collapsible">
+				<h3>I'm a header in a set of collapsibles</h3>
+				<p>I'm the collapsible content. I'm hidden by default because I have the "collapsed" state; you need to expand the header to see me.</p>
+			</div>
+			<div data-role="collapsible" data-state="collapsed">
+				<h3>I'm a header in a set of collapsibles</h3>
+				<p>I'm the collapsible content. I'm hidden by default because I have the "collapsed" state; you need to expand the header to see me.</p>
+			</div>
+			<div data-role="collapsible" data-state="collapsed">
+				<h3>I'm a header in a set of collapsibles</h3>
+				<p>I'm the collapsible content. I'm hidden by default because I have the "collapsed" state; you need to expand the header to see me.</p>
+			</div>
+		</div>
 		
 	
 	</div><!-- /content -->
diff --git a/js/jquery.mobile.collapsible.js b/js/jquery.mobile.collapsible.js
index c2eddeef..5b486eea 100644
--- a/js/jquery.mobile.collapsible.js
+++ b/js/jquery.mobile.collapsible.js
@@ -19,7 +19,8 @@ $.fn.collapsible = function(options){
 		//define
 		var collapsibleContain = $(this).addClass('ui-collapsible-contain'),
 			collapsibleHeading = $(this).find(o.heading).eq(0),
-			collapsibleContent = collapsibleContain.wrapInner('<div class="ui-collapsible-content"></div>').find('.ui-collapsible-content');				
+			collapsibleContent = collapsibleContain.wrapInner('<div class="ui-collapsible-content"></div>').find('.ui-collapsible-content'),
+			collapsibleParent = $(this).closest('[data-role=collapsible-set]').addClass('ui-collapsible-set');				
 		
 		//replace collapsibleHeading if it's a legend	
 		if(collapsibleHeading.is('legend')){
@@ -36,17 +37,12 @@ $.fn.collapsible = function(options){
 			.wrapInner('<a href="#" class="ui-collapsible-heading-toggle"></a>')
 			.find('a:eq(0)')
 			.buttonMarkup({
-				shadow: true,
+				shadow: !!!collapsibleParent.length,
 				corners:false,
 				iconPos: 'left',
 				icon: 'plus',
 				theme: o.theme
 			})
-			.removeClass('ui-btn-corner-all')
-			.addClass('ui-corner-all')
-			.find('.ui-btn-inner')
-			.removeClass('ui-btn-corner-all')
-			.addClass('ui-corner-all')
 			.find('.ui-icon')
 			.removeAttr('class')
 			.buttonMarkup({
@@ -56,35 +52,91 @@ $.fn.collapsible = function(options){
 				icon: 'plus',
 				theme: o.iconTheme
 			});
+			
+			if( !collapsibleParent.length ){
+				collapsibleHeading
+					.find('a:eq(0)')	
+					.addClass('ui-corner-all')
+						.find('.ui-btn-inner')
+						.addClass('ui-corner-all');
+			}
+			else {
+				if( collapsibleContain.data('collapsible-last') ){
+					collapsibleHeading
+						.find('a:eq(0), .ui-btn-inner')	
+							.addClass('ui-corner-bottom');
+				}					
+			}
+			
 		
 		//events
 		collapsibleContain	
-			.bind('collapse', function(){
-				collapsibleHeading
-					.addClass('ui-collapsible-heading-collapsed')
-					.find('.ui-collapsible-heading-status').text(o.expandCueText);
-				
-				collapsibleHeading.find('.ui-icon').removeClass('ui-icon-minus').addClass('ui-icon-plus');	
-				collapsibleContent.addClass('ui-collapsible-content-collapsed').attr('aria-hidden',true);						
+			.bind('collapse', function(event){
+				if( !event.isDefaultPrevented() ){
+					event.preventDefault();
+					collapsibleHeading
+						.addClass('ui-collapsible-heading-collapsed')
+						.find('.ui-collapsible-heading-status').text(o.expandCueText);
+					
+					collapsibleHeading.find('.ui-icon').removeClass('ui-icon-minus').addClass('ui-icon-plus');	
+					collapsibleContent.addClass('ui-collapsible-content-collapsed').attr('aria-hidden',true);
+					
+					if( collapsibleContain.data('collapsible-last') ){
+						collapsibleHeading
+							.find('a:eq(0), .ui-btn-inner')
+							.addClass('ui-corner-bottom');
+					}
+				}						
 				
 			})
-			.bind('expand', function(){
-				collapsibleHeading
-					.removeClass('ui-collapsible-heading-collapsed')
-					.find('.ui-collapsible-heading-status').text(o.collapseCueText);
-				
-				collapsibleHeading.find('.ui-icon').removeClass('ui-icon-plus').addClass('ui-icon-minus');	
-				collapsibleContent.removeClass('ui-collapsible-content-collapsed').attr('aria-hidden',false);
-
+			.bind('expand', function(event){
+				if( !event.isDefaultPrevented() ){
+					event.preventDefault();
+					collapsibleHeading
+						.removeClass('ui-collapsible-heading-collapsed')
+						.find('.ui-collapsible-heading-status').text(o.collapseCueText);
+					
+					collapsibleHeading.find('.ui-icon').removeClass('ui-icon-plus').addClass('ui-icon-minus');	
+					collapsibleContent.removeClass('ui-collapsible-content-collapsed').attr('aria-hidden',false);
+					
+					if( collapsibleContain.data('collapsible-last') ){
+						collapsibleHeading
+							.find('a:eq(0), .ui-btn-inner')
+							.removeClass('ui-corner-bottom');
+					}
+					
+				}
 			})
 			.trigger(o.collapsed ? 'collapse' : 'expand');
 			
+		
+		//close others in a set
+		if( collapsibleParent.length && !collapsibleParent.data("collapsiblebound") ){
+			collapsibleParent
+				.data("collapsiblebound", true)
+				.bind("expand", function( event ){
+					$(this).find( ".ui-collapsible-contain" )
+						.not( $(event.target).closest( ".ui-collapsible-contain" ) )
+						.not( "> .ui-collapsible-contain .ui-collapsible-contain" )
+						.trigger( "collapse" );
+				})
+			var set = collapsibleParent.find('[data-role=collapsible]')
+					
+			set.first()
+				.find('a:eq(0)')	
+				.addClass('ui-corner-top')
+					.find('.ui-btn-inner')
+					.addClass('ui-corner-top');
+					
+			set.last().data('collapsible-last', true)	
+		}
+					
 		collapsibleHeading.click(function(){ 
 			if( collapsibleHeading.is('.ui-collapsible-heading-collapsed') ){
-				collapsibleContain.triggerHandler('expand'); 
+				collapsibleContain.trigger('expand'); 
 			}	
 			else {
-				collapsibleContain.triggerHandler('collapse'); 
+				collapsibleContain.trigger('collapse'); 
 			}
 			return false;
 		});
diff --git a/themes/default/jquery.mobile.collapsible.css b/themes/default/jquery.mobile.collapsible.css
index 1985b184..5d89e050 100644
--- a/themes/default/jquery.mobile.collapsible.css
+++ b/themes/default/jquery.mobile.collapsible.css
@@ -12,4 +12,7 @@
 .ui-collapsible-heading a span.ui-btn .ui-icon { left: 0; margin-top: -10px; }
 .ui-collapsible-heading-status { position:absolute; left:-99999px; }
 .ui-collapsible-content {  display: block; padding: 10px 0 10px 8px; }
-.ui-collapsible-content-collapsed { display: none; }
\ No newline at end of file
+.ui-collapsible-content-collapsed { display: none; }
+
+.ui-collapsible-set { margin: .5em 0; }
+.ui-collapsible-set .ui-collapsible-contain { margin: -1px 0 0; }
\ No newline at end of file