function InfoBookmark()
{
  alert("INFORMATION ABOUT 'MAKE BOOKMARK':\nPhysics 2000 uses frames for navigation. Unfortunately, current browsers offer no easy way of bookmarking pages with frames.\nPhysics 2000, however, offers a function to solve this problem:\nIf you encounter a page you want to bookmark, select the 'MAKE BOOKMARK' option in the main (top left) menu.\nAfter the page has been reloaded, use the bookmark function of your browser.\nIf you want to bookmark another page, it is important to use the 'MAKE BOOKMARK' option again before using the bookmark function of your browser.");
}

function InfoNoFrames()
{
  alert("INFORMATION ABOUT 'NO FRAMES':\nThis will load a version of Physics 2000 which uses no frames for navigation.");
}

function InfoFrames()
{
  alert("INFORMATION ABOUT 'FRAMES':\nThis will load a version of Physics 2000 which uses frames for navigation.");
}