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<SCRIPT LANGUAGE="JavaScript">
function fun()
{
var s = document.createElement("script");
s.text="alert('fdsafdsa ');"
document.body.appendChild(s)
}
</SCRIPT>
<INPUT TYPE="button" value="new script" onclick="fun()">
<SCRIPT LANGUAGE="JavaScript">
function fun()
{
var s = document.createElement("script");
s.text="function fun2(){alert('fun2')};fun2();"
document.body.appendChild(s)
}
</SCRIPT>
<INPUT TYPE="button" value="new script" onclick="fun()">