diff --git a/js/coin.js b/js/coin.js
index 719cd3b..ae88afb 100644
--- a/js/coin.js
+++ b/js/coin.js
@@ -373,7 +373,7 @@
 			var o = {};
 			o.outpoint = {'hash':txid, 'index':index};
 			o.script = coinjs.script(script||[]);
-			o.sequence = sequence || 4294967295;
+			o.sequence = (typeof sequence===undefined) ? 4294967295 : sequence;
 			return this.ins.push(o);
 		}
 
@@ -892,7 +892,7 @@
 	}
 
 	coinjs.numToBytes = function(num,bytes) {
-		if (bytes === undefined) bytes = 8;
+		if (typeof bytes === undefined) bytes = 8;
 		if (bytes == 0) { 
 			return [];
 		} else {
diff --git a/js/coinbin.js b/js/coinbin.js
index 2a96181..332c562 100644
--- a/js/coinbin.js
+++ b/js/coinbin.js
@@ -356,7 +356,7 @@ $(document).ready(function() {
 
 		$.each($("#inputs .row"), function(i,o){
 			if($(".txId",o).val()!="" && $(".txIdN",o).val()!=""){
-				var sequence = (tx.lock_time==0) ? 4294967295 : 0;
+				var sequence = ($("#nLockTime").val()=="0") ? 4294967295 : 0;
 				tx.addinput($(".txId",o).val(), $(".txIdN",o).val(), $(".txIdScript",o).val(), sequence);
 			}
 		});