gistfile1.js

// ==UserScript==
// @name           MPUK Forum Banner Head Removal
// @namespace      http://leenux.org.uk/
// @description    Removes awful header thingy that people hate
// @include        http://forums.multiplay.co.uk/*
// ==/UserScript==

var allDivs, thisDiv;
allDivs = document.evaluate(
    "//div[@class='main-page']",
    document,
    null,
    XPathResult.UNORDERED_NODE_SNAPSHOT_TYPE,
    null);
    
for (var i = 0; i < allDivs.snapshotLength; i++) {

    thisDiv = allDivs.snapshotItem(i);
    thisDiv.removeChild(thisDiv.children[0]);
}