Add nLocktime to a raw Bitcoin transcation

gistfile1.txt

String.prototype.lpad = function(padString, length) {
      var str = this;
      while (str.length < length)
          str = padString + str;
      return str;
  }

var blockHeight = 434695,
    rawTx = '<raw transaction>',
    blockLittleEndian = (blockHeight).toString(16).lpad('0', 8).match(/../g).reverse().join('');
    
document.write(rawTx.slice(0, -8) + blockLittleEndian);