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IE5.5+
opener=null;
window.close()
IE5
1<object classid="clsid:adb880a6-d8ff-11cf-9377-00aa003b7a11" id="clo" type="application/x-oleobject">
2<param name="Command" value="Close"/></object>
1<button onclick="clo.Click()"><font face="webdings">r</font></button>