var imagenumber1 = 4 ;
var randomnumber1 = Math.random() ;
var rand1 = Math.round( (imagenumber1-1) * randomnumber1) + 1 ;
images = new Array
images[1] = "../img/fotos/castells_01.jpg"
images[2] = "../img/fotos/castells_02.jpg"
images[3] = "../img/fotos/castells_03.jpg"
images[4] = "../img/fotos/castells_04.jpg"
var imagen = images[rand1]
ref = new Array
ref[1] = "Profesor Manuel Castells"
ref[2] = "Profesor Manuel Castells"
ref[3] = "Profesor Manuel Castells"
ref[4] = "Profesor Manuel Castells"
var alt = ref[rand1]

function expandCollapse() {
	for (var i=0; i<expandCollapse.arguments.length; i++) {
		var element = document.getElementById(expandCollapse.arguments[i]);
		element.style.display = (element.style.display == "none") ? "block" : "none";
	}
}