oPopup = window.createPopup([vArgs])

where vArgs are yet to be defined. You reveal the popup window by the show() method. You send it away by clicking somewhere outside the popup window. Since the window is a regular object, you can format the popup text as you see fit. Here is a popup window that demonstrates the box' background and border:

<SCRIPT LANGUAGE="JavaScript">
<!--
var oPopup = window.createPopup();
var oPopupBody = oPopup.document.body;
oPopupBody.style.backgroundColor = "magenta";
oPopupBody.style.border = "solid blue 3px";
oPopupBody.innerHTML = "Click outside <B>popup</B> to close.";
oPopup.show(300, 80, 200, 50, document.body);
// -->
</SCRIPT>

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