function swapContent(divID) {
				if (document.getElementById('contentA')) { document.getElementById('contentA').className = 'hidden'; }
				if (document.getElementById('contentB')) { document.getElementById('contentB').className = 'hidden'; }
				if (document.getElementById('contentC')) { document.getElementById('contentC').className = 'hidden'; }
				if (document.getElementById('contentD')) { document.getElementById('contentD').className = 'hidden'; }
				if (document.getElementById('contentE')) { document.getElementById('contentE').className = 'hidden'; }
				if (document.getElementById('contentF')) { document.getElementById('contentF').className = 'hidden'; }
				if (document.getElementById(divID)) { document.getElementById(divID).className = 'visible'; }
			}