function setVisibility(id, visibilityy) {
document.getElementById(id).style.visibility = visibilityy;
}

function rollover(name){
    var ranum=Math.floor((Math.random()*30)+1);
    document.images[name].src='global/images/block'+ranum+'.png';
}

function rolloverGREY(name){
    var ranum=Math.floor((Math.random()*30)+1);
    document.images[name].src='http://www.october4th1957.com/global/images/blockGREY'+ranum+'.png';
}

function rolloverSWITCH(name){
   var source = document.images[name].src;

   if (source == 'http://www.october4th1957.com/global/images/blockGREY11_off.png') {
      document.images[name].src='global/images/blockGREY11_on.png';
   } else {
      document.images[name].src='global/images/blockGREY11_off.png';
   }
}

function rolloverBLOCK11(name){
   var source = document.images[name].src;

   if (source == 'http://www.october4th1957.com/global/images/blockGREY11_off.png') {
      document.images[name].src='global/images/block11_on.png';
      document.getElementById('blocks2').style.visibility = 'visible';
      document.getElementById('email').style.visibility = 'visible';
   } else {
      document.images[name].src='global/images/blockGREY11_off.png';
      document.getElementById('blocks2').style.visibility = 'hidden';
      document.getElementById('email').style.visibility = 'hidden';
   }
}