function openwin(url,x,y,name) {
cx=screen.width/2 - (x/2);
cy=screen.height/2-(y/2);
window.open(url,name,"toolbar=no,status=no,location=no,directories=no,menubar=no,resizable=yes,width="+x+",height="+y+",scrollbars=yes,top="+cy+",left="+cx);
}