diff --git a/asn1.js b/asn1.js
index ec51ae8..f29f366 100644
--- a/asn1.js
+++ b/asn1.js
@@ -37,15 +37,16 @@ Stream.prototype.hexDigits = "0123456789ABCDEF";
 Stream.prototype.hexByte = function (b) {
     return this.hexDigits.charAt((b >> 4) & 0xF) + this.hexDigits.charAt(b & 0xF);
 };
-Stream.prototype.hexDump = function (start, end) {
+Stream.prototype.hexDump = function (start, end, raw) {
     var s = "";
     for (var i = start; i < end; ++i) {
         s += this.hexByte(this.get(i));
-        switch (i & 0xF) {
-        case 0x7: s += "  "; break;
-        case 0xF: s += "\n"; break;
-        default:  s += " ";
-        }
+        if (raw !== true)
+            switch (i & 0xF) {
+            case 0x7: s += "  "; break;
+            case 0xF: s += "\n"; break;
+            default:  s += " ";
+            }
     }
     return s;
 };
@@ -416,6 +417,9 @@ ASN1.prototype.toHexDOM = function (root) {
     }
     return node;
 };
+ASN1.prototype.toHexString = function (root) {
+    return this.stream.hexDump(this.posStart(), this.posEnd(), true);
+};
 ASN1.decodeLength = function (stream) {
     var buf = stream.get();
     var len = buf & 0x7F;
diff --git a/index.html b/index.html
index 5ca721c..19d3eba 100644
--- a/index.html
+++ b/index.html
@@ -10,7 +10,8 @@
   <script type="text/javascript" src="oids.js"></script>
   <script type="text/javascript" src="asn1.js"></script>
   <script type="text/javascript">
-    var reHex = /^\s*(?:[0-9A-Fa-f][0-9A-Fa-f]\s*)+$/;
+    var reHex = /^\s*(?:[0-9A-Fa-f][0-9A-Fa-f]\s*)+$/,
+	hash = null;
     function id(id) {
         return document.getElementById(id);
     }
@@ -24,10 +25,16 @@
         tree.innerHTML = '';
         dump.innerHTML = '';
         try {
-            var asn1 = ASN1.decode(der);
+            var asn1 = ASN1.decode(der),
+                hex = asn1.toHexString();
             tree.appendChild(asn1.toDOM());
             if (id('wantHex').checked)
                 dump.appendChild(asn1.toHexDOM());
+            if (id('pem').value == '') 
+                id('pem').value = hex;
+            // update URL hash (does this have length limits we should avoid?)
+            hash = '#' + hex;
+            window.location.hash = hash;
         } catch (e) {
             tree.innerHTML = toHTML(e);
         }
@@ -42,6 +49,7 @@
             decode(der);
         } catch (e) {
             tree.innerHTML = toHTML(e);
+            dump.innerHTML = '';
         }
         return false;
     }
@@ -67,6 +75,7 @@
     }
     function load() {
         var file = id('file');
+        id('pem').value = ''; // clear text area, will get hex content
         if (!file.files) {
             alert("Your browser doesn't support reading files; try Firefox or Chrome.");
             return false;
@@ -96,8 +105,9 @@
         return false;
     }
     function loadFromHash() {
-        if (window.location.hash) {
-            id('pem').value = window.location.hash.substring(1);
+        if (window.location.hash && window.location.hash != hash) {
+            hash = window.location.hash;
+            id('pem').value = hash.substring(1);
             decodeArea();
         }
     }