function dores_winter() {
    if(screen.width == 640||screen.width == 800||screen.width == 1024||screen.width == 1152)
      alert("You want to download HippoPaper: Winter (" + screen.width + "x" + screen.height + ")");
    else
      alert("Your current screen resolution (" + screen.width + "x" + screen.height + ") does not have a matching wallpaper.");
}

function dores_holiday() {
    if(screen.width == 640||screen.width == 800||screen.width == 1024||screen.width == 1152)
      alert("You want to download HippoPaper: Holiday (" + screen.width + "x" + screen.height + ")");
    else
      alert("Your current screen resolution (" + screen.width + "x" + screen.height + ") does not have a matching wallpaper.");

}

function shake(n) {
   if (self.moveBy) {
     for (i = 10; i > 0; i--) {
       for (j = n; j > 0; j--) {
         self.moveBy(0,i);
         self.moveBy(i,0);
         self.moveBy(0,-i);
         self.moveBy(-i,0);
       }
    }    
   }
}