var win = null;
function NewWindow(mypage,myname,w,h,scroll,resizable){
LeftPosition = (screen.width) ? (screen.width-w)/2 : 0;
TopPosition = (screen.height) ? (screen.height-h)/2 : 0;
if(resizable=='') resizable='yes'
settings =
'height='+h+',width='+w+',top='+TopPosition+',left='+LeftPosition+',scrollbars='+scroll+',resizable='+resizable

win = window.open(mypage,myname,settings)
}