Q936 How can a function return true first time, then false, then true....?

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Try:

<script language="JavaScript"><!--
var bool=false;
function not() { return (bool = !bool); }

alert(not());
alert(not());
alert(not());
alert(not());
//--></script>

Although you don't really need a function for this, just:

<script language="JavaScript"><!--
var bool=false;

alert(bool = !bool);
alert(bool = !bool);
alert(bool = !bool);
alert(bool = !bool);
//--></script>