function winOpen1(){
  win1=window.open("clouds_per_second.html","clouds","toolbar=0 , location=0 , directories=0 , status=0 , menubar=0 , scrollbars=0 , resizable=0 , Width=800 , Height=580");
}
function winOpen2(){
  win2=window.open("fountain.html","fountain","toolbar=0 , location=0 , directories=0 , status=0 , menubar=0 , scrollbars=0 , resizable=0 , Width=800 , Height=580");
}
function winOpen3(){
  win3=window.open("raindrop.html","raindrop","toolbar=0 , location=0 , directories=0 , status=0 , menubar=0 , scrollbars=0 , resizable=0 , Width=769 , Height=511");
}