// Commonly use functions

function showElement(layer) { document.getElementById(layer).style.visibility="visible"; }
function hideElement(layer) { document.getElementById(layer).style.visibility="hidden"; }
function showBlock(layer) { document.getElementById(layer).style.display = 'block'; }
function hideBlock(layer) { document.getElementById(layer).style.display = 'none'; }
function toggleDisplay(id) {
       var e = document.getElementById(id);
       if(e.style.display == 'block')
          e.style.display = 'none';
       else
          e.style.display = 'block';
		return false; //prevents links from activating
    }
function toggleVisibility(id) {
       var e = document.getElementById(id);
       if(e.style.visibility == 'visible')
          e.style.visibility = 'hidden';
       else
          e.style.visibility = 'visible';
    }

function noLink(){ return false; }