var win = null;
function window_centree(mypage,myname,w,h,scroll) {
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=0'+scroll+',resizable=0'
win = window.open(mypage,myname,settings)
if(win.window.focus){win.window.focus();}
}