Unescape HTML entities in Javascript?

Question

I have some Javascript code that communicates with an XML-RPC backend. The XML-RPC returns strings of the form:

Answer 1

First create a somewhere in the body

Next, assign the string to be decoded as innerHTML to this:

document.getElementById("decodeIt").innerHTML=stringtodecode

Finally,

stringtodecode=document.getElementById("decodeIt").innerText

Here is the overall code:

var stringtodecode="Hello world
";
document.getElementById("decodeIt").innerHTML=stringtodecode;
stringtodecode=document.getElementById("decodeIt").innerText