diff --git a/eth/BigInteger.js b/eth/BigInteger.js
index 2509833a7..e4a9d1c7b 100644
--- a/eth/BigInteger.js
+++ b/eth/BigInteger.js
@@ -53,7 +53,7 @@
 	}
         if (text === "-0") text = "0";
 	text = text.toUpperCase();
-        var isValid = (base == 16 ? /^[0-9A-F]+$/ : /^[0-9]+$/).test(text);
+        var isValid = (base == 16 ? /^[0-9A-F]*$/ : /^[0-9]+$/).test(text);
         if (!isValid) throw new Error("Invalid integer");
 	if (base == 16) {
 		var val = bigInt(0);
@@ -335,7 +335,7 @@
                     str = str.slice(1);
                 }
                 if (!str.length) str = "0";
-                var s = first.sign === sign.positive ? "" : "-";
+                var s = (first.sign === sign.positive || str == "0") ? "" : "-";
                 return s + str;
             },
             toHex: function (m) {
diff --git a/eth/eth.js b/eth/eth.js
index 7e3e71b1f..81fb524fd 100644
--- a/eth/eth.js
+++ b/eth/eth.js
@@ -1,7 +1,18 @@
+if (typeof(window.eth) === "undefined")
+{
 if (typeof(require) !== "undefined")
 	require( ['ethString'], function() {} )
 else if (typeof(String.prototype.pad) === "undefined")
-	alert("You need to have included ethString.js for eth to work.")
+{
+	var scriptTag = document.getElementsByTagName('script');
+	scriptTag = scriptTag[scriptTag.length - 1]; 
+	var scriptPath = scriptTag.src; 
+	var path = scriptPath.substr(0, scriptPath.lastIndexOf( '/' ));
+	var start = '<script src="' + path + '/';
+	var slash = '"><'+'/script>';
+	document.write(start + 'BigInteger.js' + slash);
+	document.write(start + 'ethString.js' + slash);
+}
 
 var spec = [
     { "method": "coinbase", "params": null, "returns" : "" },
@@ -108,3 +119,5 @@ window.eth = (function ethScope() {
 	return ret;
 }());
 
+}
+
diff --git a/eth/ethString.js b/eth/ethString.js
index 98054ce08..bca4fe100 100644
--- a/eth/ethString.js
+++ b/eth/ethString.js
@@ -29,9 +29,9 @@ String.prototype.bin = function() {
 		bytes = []
 		var i = 2;
 		// Check if it's odd - pad with a zero if so.
-		if (s.length % 2)
+		if (this.length % 2)
 			bytes.push(parseInt(this.substr(i++, 1), 16))
-		for (; i < s.length - 1; i += 2)
+		for (; i < this.length - 1; i += 2)
 		    bytes.push(parseInt(this.substr(i, 2), 16));
 		return String.fromCharCode.apply(String, bytes);
     } else if (/^\d+$/.test(this))
@@ -51,4 +51,12 @@ String.prototype.unbin = function() {
     return "0x" + o;
 }
 
+String.prototype.dec = function() {
+    return bigInt(this.substr(0)).toString()
+}
+
+String.prototype.hex = function() {
+    return bigInt(this).toHex()
+}
+