I have recently taken over a new website but when I get the source code its unescaped in JavaScript like this:

```
%3C%21DOCTYPE%20html%3E%0A%3Chtml%3E%0A%3Chead%3E%0A

```

Unfortunetly I do not know what the %XX thingys are called so I cant find a converter to convert it back into HTML.

Thanks in advance. (sorry for the poor explaining I just don't know how to explain this.)