<!-- 
function popPDF(f) { 
   window.open('', 'pdfWin','scrollbars=yes,resizable=yes,width=800,height=600'); 
   f.target='pdfWin'; 
   return true; 
}
<!-- 
function popHTML(f) { 
   window.open('', 'pdfWin','toolbar=yes,scrollbars=yes,resizable=yes,width=800,height=600'); 
   f.target='pdfWin'; 
   return true; 
}
function popMEDIA(f) { 
   window.open('', 'pdfWin','toolbar=no,scrollbars=yes,resizable=no,width=800,height=600'); 
   f.target='pdfWin'; 
   return true; 
}
function pop_images(f) { 
   window.open('', 'imgWin','width=550,height=550'); 
   f.target='imgWin'; 
   return true; 
}

image01= new Image(1,1)
image01.src="/physics/media/sph3u_on.gif"
image02= new Image(1,1)
image02.src="/physics/media/sph3u_off.gif"
image03= new Image(1,1)
image03.src="/physics/media/sph4u_on.gif"
image04= new Image(1,1)
image04.src="/physics/media/sph4u_off.gif"
image05= new Image(1,1)
image05.src="/physics/media/sph4c_on.gif"
image06= new Image(1,1)
image06.src="/physics/media/sph4c_off.gif"
image07= new Image(1,1)
image07.src="/physics/media/common_graphics/address_on.gif"
image08= new Image(1,1)
image08.src="/physics/media/common_graphics/address_off.gif"
image09= new Image(1,1)
image09.src="/physics/media/common_graphics/video_tutorials_splash_on.gif"
image10= new Image(1,1)
image10.src="/physics/media/common_graphics/video_tutorials_splash_off.gif"

function rollover(imagename, newsrc)
{
  document.images[imagename].src=newsrc.src
}
//-->