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I was just reading this question and wanted to try the alias method rather than the function-wrapper method, but I couldn't seem to get it to work in either Firefox 3 or 3.5beta4, or Google Chrome, both in their debug windows and in a test web page. Firebug: >>> window.myAlias = document.getElementById function() >>> myAlias('item1') >>> window.myAlias('item1') >>> document.getElementById('item1') <div id="item1"> If I put it in a web page, the call to myAlias gives me this error: uncaught exception: [Exception... "Illegal operation on WrappedNative prototype object" nsresult: "0x8057000c (NS_ERROR_XPC_BAD_OP_ON_WN_PROTO)" location: "JS frame :: file:///[...snip...]/test.html :: <TOP_LEVEL> :: line 7" data: no] Chrome (with >>>'s inserted for clarity): >>> window.myAlias = document.getElementById function getElementById() { [native code] } >>> window.myAlias('item1') TypeError: Illegal invocation >>> document.getElementById('item1') <div id=?"item1">? And in the test page, I get the same "Illegal invocation". Am I doing something wrong? Can anyone else reproduce this? Also, oddly enough, I just tried and it works in IE8.

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