function pop (url,w,h,s,f) {
LeftPosition =(screen.width) ? (screen.width-w)/2 : 0;
TopPosition = (screen.height) ? (screen.height-h)/2 : 0;
window.open(url,'new','width='+w+',height='+h+',top='+TopPosition+',left='+LeftPosition+',scrollbars='+s+',fullscreen='+f+'')
}