Index: lams_central/web/comments/new.jsp
===================================================================
diff -u -rb511b89c988cca308db39d308edba633c9556f81 -r7c989d5270a87d9d03fa9d95c3dc7726f67b169f
--- lams_central/web/comments/new.jsp	(.../new.jsp)	(revision b511b89c988cca308db39d308edba633c9556f81)
+++ lams_central/web/comments/new.jsp	(.../new.jsp)	(revision 7c989d5270a87d9d03fa9d95c3dc7726f67b169f)
@@ -69,6 +69,7 @@
 	
 	function clearNewForm() {
 		$('#newFormBody').val('');
+		enableButton(btnName);
 		return false;
 	}
 	
Index: lams_central/web/comments/reply.jsp
===================================================================
diff -u -r4df9f0edfb3b0b15dd52743caf6c655a461b531c -r7c989d5270a87d9d03fa9d95c3dc7726f67b169f
--- lams_central/web/comments/reply.jsp	(.../reply.jsp)	(revision 4df9f0edfb3b0b15dd52743caf6c655a461b531c)
+++ lams_central/web/comments/reply.jsp	(.../reply.jsp)	(revision 7c989d5270a87d9d03fa9d95c3dc7726f67b169f)
@@ -26,6 +26,14 @@
 	});
 	
 	function replyFormSubmit() {
+	
+		var btnName = "replyCommentSubmitButton";
+		if ( isDisabled(btnName) ) {
+			return false;
+		}
+
+		disableButton(btnName);
+	
 		var theForm = $(replyForm);
 		if ( validateBodyText($('#replyFormBody').val(), <%=CommentConstants.MAX_BODY_LENGTH%>, "<fmt:message key="label.comment.body.validation" />") ) {
 
@@ -47,7 +55,10 @@
 			reloadThread(response,'<lams:LAMSURL />','<fmt:message key="error.cannot.redisplay.please.refresh"/>','<fmt:message key="error.please.refresh"/>');
 			});
 		} // end validateBodyText
-	return false;
+		else {
+			enableButton(btnName);
+		}
+		return false;
 	}
 	
 	function cancelReply() {
@@ -67,7 +78,7 @@
 		<a href="#" onclick="javascript:cancelReply();" class="button">
 			<fmt:message key="label.cancel" />
 		</a>&nbsp;
-		<a href="#" onclick="javascript:replyFormSubmit();" class="button">
+		<a href="#" onclick="javascript:replyFormSubmit();" class="button" id="replyCommentSubmitButton">
 			<fmt:message key="label.post" />
 		</a>
 	</div>
Index: lams_central/web/includes/javascript/comments.js
===================================================================
diff -u -r4df9f0edfb3b0b15dd52743caf6c655a461b531c -r7c989d5270a87d9d03fa9d95c3dc7726f67b169f
--- lams_central/web/includes/javascript/comments.js	(.../comments.js)	(revision 4df9f0edfb3b0b15dd52743caf6c655a461b531c)
+++ lams_central/web/includes/javascript/comments.js	(.../comments.js)	(revision 7c989d5270a87d9d03fa9d95c3dc7726f67b169f)
@@ -42,3 +42,17 @@
     		alert(errorCannotRedisplayMessage);
     	} 
 	}
+	
+	/** Disable the submit button when pressed to stop double submission. disabled = true doesn't stop the link working it just
+	 * greys it out. So we need to test with isDisabled() in the submit methods too! Messy. */
+	function disableButton(buttonId) {
+		$("#"+buttonId).attr("disabled", true); 
+		$("#"+buttonId).addClass("disabled"); 
+	}
+	function isDisabled(buttonId) {
+		return $("#"+buttonId).attr("disabled");
+	}
+	function enableButton(buttonId) {
+		$("#"+buttonId).removeAttr("disabled");
+		$("#"+buttonId).removeClass("disabled"); 
+	}