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    function add1()
   {
   var obtn=document.createElement("input");
obtn.setAttribute("type","button");
obtn.setAttribute("value","test1");
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function add2()
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   obtn.value="test2";
   document.body.appendChild(obtn);
}
function add3()
{
   var obtn="<input type='button' value='test3'/>";
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}
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