function openHelp(){ 
wx = 500;
wy = 660;
x = (screen.width  - wx) / 2;
y = (screen.height - wy) / 2;
subWin = window.open("help.html","sub","scrollbars=no,location=no,menubar=no,left="+x+",top="+y+",width="+wx+",height="+wy);
 }