Javascript: context of this

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<script language="JavaScript" type="text/javascript">
var var_onclick = new Function("f(this);");
function f_onclick() { f(this); }
function f(node) {
   var debug = document.getElementById("debug");
   debug.value += node+"\n";
   debug.value += ", "+node.innerHTML+"\n";
<span onclick='f(this);' >span</span>
<button onclick='f(this);' >a</button>
<span onclick='var_onclick();' >span</span>
<button onclick='var_onclick();' >a</button>
<span onclick='f_onclick();' >span</span>
<button onclick='f_onclick();' >a</button>
<textarea id=debug rows=12 cols=100 >

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