function openPopup(windowname, url, width, height) {
	var newwin = window.open(url,windowname,"toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=yes,resizable=no,width="+width+",height="+height+getCenterPopup(width,height,1,1)+"");
	newwin.focus();
	return false;
}

function getCenterPopup(width,height,cx,cy) {
	var x=(cx==0)?0:(cx==1)?parseInt((screen.width-width-10)/2):screen.width-width-10;
	var y=(cy==0)?0:(cy==1)?parseInt((screen.height-height-56)/2):screen.height-height-56;
	return (",top="+y+",left="+x);
}