function popup(pURL, pName, pWidth, pHeight, pScroll) {	
	// calc off centered left coordinates.
	nLeft = (screen.width - pWidth) / 4;
	nTop = (screen.height - pHeight) / 3;
	winprops = 'height='+pHeight+',width='+pWidth+',top='+nTop+',left='+nLeft+',scrollbars='+pScroll

	
	win=window.open("",pName,winprops);
	win.location = pURL;
	return win;
}