/*
  Standards Compliant Rollover Script
  Author : Daniel Nolan
  http://www.bleedingego.co.uk/webdev.php
 
  With modifs for Dialnet by Eloy Lafuente (stronk7)
  with modifs for BUCLM by Julio Arévalo
 */

addEvent(window, 'load', initRollovers);

function initRollovers() {
    if(!document.getElementById) return;
    
    var aPreLoad = new Array();
    var sTempSrc;
    var aImages = document.getElementsByTagName("img");
    
    for(var i = 0; i < aImages.length; i++) {
        if(aImages[i].className.match(/^rollover|^rollover | rollover | rollover$|rollover$/)) {
            var src = aImages[i].getAttribute("src");
            var ftype = src.substring(src.lastIndexOf("."), src.length);
            var hsrc = src.replace("_bn" + ftype, ftype);
            
            aImages[i].setAttribute("hsrc", hsrc);
            
            aPreLoad[i] = new Image();
            aPreLoad[i].src = hsrc;
            
            aImages[i].onmouseover = function() {
                sTempSrc = this.getAttribute("src");
                this.setAttribute("src", this.getAttribute("hsrc"));
            }
            
            aImages[i].onmouseout = function() {
                if(!sTempSrc) {
                    sTempSrc = this.getAttribute("src").replace(ftype, "_bn" + ftype);
                }
                this.setAttribute("src", sTempSrc);
            }
        }
    }
}

function addEvent(objeto, evType, fn) {
    if (objeto.addEventListener) {
        objeto.addEventListener(evType, fn, false);
        return true;
    } else if (objeto.attachEvent) {
        var r = objeto.attachEvent("on" + evType, fn);
        return r;
    } else {
        return false;
    }
}