function PopUp(mypage,myname,w,h,sc){

LeftPosition = (screen.width) ? (screen.width-w)/2 : 0;
TopPosition = (screen.height) ? (screen.height-h)/2 : 0;
settings = 'height='+h+',width='+w+',top='+TopPosition+',left='+LeftPosition+',scrollbars='+sc+',resizable=0'
win = window.open(mypage,myname,settings)
}