function openwin(h,w,url)
{
	popupwindow=window.open(url,"popup","width="+w+",height="+h+",top=" + ((screen.height/2)-(h/2)) + ",left=" + ((screen.width/2)-(w/2)) + ",scrollbars=yes");
}

function PopUp(){
openwin(400,500,"news.htm");
}