var popWindow = null;

function popwindow(url,width,height) {
	var midX = (screen.width/2)-(width/2);
	var midY = (screen.height/2)-(height/2);
	popWindow = window.open (''+[url]+'','popwin', "width="+[width]+",height="+[height]+",toolbar=no,menubar=no,scrollbars=yes,resizable=yes,top="+midY+",left="+midX+",screenX="+midX+",screenY="+midY+"");
	popWindow.focus();

}