function toBinaryString(str) {
  var _toBinaryString = function(char) {
    var dividends = [];
    var num = char.charCodeAt(0);
    var bytes = [];
    var last = 0;
    var pos = 0;
    while(last < num) {
      var curr = Math.pow(2,pos);
      last = curr;
      pos++;
      dividends.unshift(curr);
    }
    for(var i=0;i<dividends.length;i++){
      var val = Math.floor(num/dividends[i]);
      bytes.push(val);
      num = (val > 0) ? num - dividends[i] : num;
    }
    if(bytes.length < 8) {
       var pad = 8 - bytes.length;
      for(var j = 0;j<pad;j++){
        bytes.unshift(0)
      }
    }
    return bytes.join("");
  }
  var result = "";
  for(var i=0;i<str.length;i++){
    result += _toBinaryString(str[i]);
  }
  return result;
}