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Js_file01.js 
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document.write(" <script  language=\"javascript\"  src="\/com\/ Js_file02.js \"  > <\/script>"); 
 
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<html>
<body>
<input type="button" value="ok" onclick="javascript:fun_b()">
</body>
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<script language="JAVASCRIPT" src='Js_b.js'> </script>
</html>
 
Js_b.js
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new_element=document.createElement("script");
new_element.setAttribute("type","text/javascript");
new_element.setAttribute("src"," Js_a.js");
document.body.appendChild(new_element);
 
function fun_b ()
{
Fun_a();
}
 
Js_a.js
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function Fun_a ()
{
alert("a");
}
 
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Js_file01.js 
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document.scripts[0].src=" Js_file02.js"   // only ie
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<HEAD id="Head1">
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<script type="text/javascript">
function exec (command)
{
window.oldOnError = window.onerror;
window._command = command;
window. ......

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<a href="javascript:void(0);" mce_href="javascript:void(0);" ><img id="SubmitFeedback" src="/images/comment_btn.gif" mce_src="images/comment_btn.gif" /></a>
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