Logic if

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#title>Untitled Document#/title>
#script>
str=" nama ku namaku ";
i=0;
function anim()
{
f.t.value=str.substring(i,str.length);
i++;
if(i>str.length)
{
i=0;
}
setTimeout("anim()",100);
}
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#/head>

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#input type="text" name="t" size="50" style="border:0"/>
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#/body>