// Amaga el contingut del <div id="name"></div>
function amaga(name) 
{
	var NN= (document.layers ? true : false);
	var hideName = (NN ? 'hide' : 'hidden');
	var showName = (NN ? 'show' : 'visible');
	// Define a central function to reference layers
	function refSlide(name) 
		{
		if (NN) 
			{
			return document.layers[name]; 
			}
  		else
			{
			return eval('document.all.' + name + '.style');
			}
		}
	refSlide(name).visibility = hideName;
}

// Mostra el contingut del <div id="name"></div>
function mostra(name)
{
	var NN= (document.layers ? true : false);
	var hideName = (NN ? 'hide' : 'hidden');
	var showName = (NN ? 'show' : 'visible');
	// Define a central function to reference layers
	function refSlide(name) 
		{
		if (NN) 
			{
			return document.layers[name]; 
			}
  		else
			{
			return eval('document.all.' + name + '.style');
			}
		}
	refSlide(name).visibility = showName;
}

// Canvia l'estat de visibilitat del contingut del <div id="name"></div>
// Modificat milleski 2011

function canvia(name)
{
	var NN= (document.layers ? true : false);
	var hideName = (NN ? 'hide' : 'hidden');
	var showName = (NN ? 'show' : 'visible');
	var estat_actual;
	// Define a central function to reference layers
	function refSlide(name) 
		{
		if (NN) 
			{
			return document.layers[name]; 
			}
  		else
			{
			return eval('document.all.' + name + '.style');
			}
		}
	estat_actual = refSlide(name).visibility;
	if(estat_actual == hideName)
		{
		refSlide(name).visibility = showName;
		}
	else
		{
		refSlide(name).visibility = hideName;
		}
}

function intercanvia(nom_1, nom_2)
{
canvia(nom_1);
canvia(nom_2);
 }

function checkform ( camp )
{

  // ** START **
  if (camp.value == "") {
    alert( "Please enter your email address." );
    camp.focus();
    return false ;
  }
  // ** END **
  return true ;
}