function winOpen1(){
  win1=window.open("try_raindrop.html","raindrop","toolbar=0 , location=0 , directories=0 , status=0 , menubar=0 , scrollbars=0 , resizable=0 , Width=769 , Height=511");
}
function winOpen2(){
  win2=window.open("try_disappear.html","disappear","toolbar=0 , location=0 , directories=0 , status=0 , menubar=0 , scrollbars=0 , resizable=0 , Width=800 , Height=500");
}
function winOpen3(){
  win3=window.open("contact.html","contact","toolbar=0 , location=0 , directories=0 , status=0 , menubar=0 , scrollbars=1 , resizable=0 , Width=540 , Height=430");
}
function winOpen4(){
  win3=window.open("experiment.html","experiment","toolbar=0 , location=0 , directories=0 , status=0 , menubar=0 , scrollbars=1 , resizable=0 , Width=630 , Height=600");
}