function popup (page,realm,winWidth,winHeight)
{
	var winLeft = (screen.width - winWidth)/2;
	var winTop = (0.8*screen.height - winHeight)/2;
	window.open(page,realm,"toolbar=0,scrollbars=1,location=0,statusbars=0,menubars=0,toolbar=0,resizable=0,left="+winLeft+",top="+winTop+",width="+winWidth+",height="+winHeight);
}