// Selector de Estilo 
function setStyle(styleName) {
	setActiveStyleSheet(styleName);
}

function setActiveStyleSheet(title) {
	var i, a, main;
	
	for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
		if(a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title")) {
			a.disabled = true;
			if(a.getAttribute("title") == title) {
				a.disabled = false;
			}
		}
	}
}

//Añadido por SR para las imágenes aletorias

var mis_imagenes = new Array()
mis_imagenes[0] = 'http://www.tecnun.es/fileadmin/template/images/1.jpg'
mis_imagenes[1] = 'http://www.tecnun.es/fileadmin/template/images/2.jpg'
mis_imagenes[2] = 'http://www.tecnun.es/fileadmin/template/images/3.jpg'
mis_imagenes[3] = 'http://www.tecnun.es/fileadmin/template/images/4.jpg'
mis_imagenes[4] = 'http://www.tecnun.es/fileadmin/template/images/5.jpg'
mis_imagenes[5] = 'http://www.tecnun.es/fileadmin/template/images/6.jpg'
mis_imagenes[6] = 'http://www.tecnun.es/fileadmin/template/images/7.jpg'
var j = 0
var p = mis_imagenes.length;
var preBuffer = new Array()
for (i = 0; i < p; i++){
preBuffer[i] = new Image()
preBuffer[i].src = mis_imagenes[i]
}
var mi_imagen = Math.round(Math.random()*(p-1));
function muestra_imagen(){
document.write('<img src="'+mis_imagenes[mi_imagen]+'">');
}