function reverse()
{document.getElementById('logo').src="data/images/logo.jpg"; document.getElementById('enter').src="data/images/enter.jpg"; document.getElementById('enter').width="351"; document.getElementById('enter').height="54"}

function normal()
{document.getElementById('logo').src="data/images/logo_reverse.jpg"; document.getElementById('enter').width="0"; document.getElementById('enter').height="0"}

function no_sel()
{document.getElementById('faces').src="images/faces.png";} 

function veronica()
{document.getElementById('faces').src="images/veronica.png";}

function davide()
{document.getElementById('faces').src="images/davide.png";}

function marco()
{document.getElementById('faces').src="images/marco.png";}

function alessio()
{document.getElementById('faces').src="images/alessio.png";}

function Show()
{
if(document.getElementById('imglist').style.visibility=="hidden")
  document.getElementById('imglist').style.visibility="visible";
}