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<iframe name="new"> </iframe> 
<a href="login.htm" id="other" target="new">login </a>
...
<a href="link.htm" id="mine" target="new">open </a>

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¡¡¡¡login ⇒ logout
¡¡¡¡login.htm ⇒ logout.htm

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HTML code<iframename="new" id="new" style="border:1px solid red;width:500px;height:200px;"></iframe><ahref="login.htm" id="other" target="new">login</a>
...<ahref="link.htm" onclick="op()" id="mine" target="new">open</a><scripttype="text/javascript">function op(){
document.getElementById('other').href='logout.htm';
document.getElementById('other').innerHTML='logout';
}</script>

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