function preload() {
if (document.images)
{ 
prel = new Array(10);
for(i = 0; i < 10; i++) 
{ prel[i] = new Image(); }
prel[0].src = "images/logo.jpg";
}
}

function swap(pic,AB) {
if ( AB == "B" )
{ document.getElementById(pic).src = 'images/' + pic + 'B.jpg';}
if ( AB == "A" )
{ document.getElementById(pic).src = 'images/' + pic + '.jpg'; }
}

function showdiv(whichdiv)
  {
    hidedivs();
    var thatdiv = document.getElementById(whichdiv);
    thatdiv.style.display="block";
  }

function hidedivs()
  {
    document.getElementById("proofread").style.display="none";
  }