var myimages=new Array()
function preloadimages(){
for (i=0;i<preloadimages.arguments.length;i++){
myimages[i]=new Image()
myimages[i].src=preloadimages.arguments[i]
}
}

preloadimages("imagens/fundo.jpg", "imagens/topo.jpg", "imagens/meio.jpg", "imagens/buttoncontac.jpg","imagens/buttoncontacpress.jpg","imagens/buttonempresa.jpg","imagens/buttonempresapress.jpg","imagens/buttoninicio.jpg","imagens/buttoniniciopress.jpg","imagens/buttonmanuais.jpg","imagens/buttonmanuaispress.jpg","imagens/buttonserv.jpg","imagens/buttonservpress.jpg")

function roll_over(img_name, carrega)
   {
         if (carrega==1) {
              document[img_name].src = "imagens/"+img_name+"press.jpg";
         }
         else {
              document[img_name].src = "imagens/"+img_name+".jpg";
         }
   }
   
var state = 'none';

function showhide(layer_ref, carrega) {

if (carrega == 0) {
state = 'none';
}
else {
state = 'block';
}
if (document.all) { //IS IE 4 or 5 (or 6 beta)
eval( "document.all." + layer_ref + ".style.display = state");
}
if (document.layers) { //IS NETSCAPE 4 or below
document.layers[layer_ref].display = state;
}
if (document.getElementById &&!document.all) {
hza = document.getElementById(layer_ref);
hza.style.display = state;
}
}

function popup(pagina) {
window.open(pagina,"Tiraqui","width=330,height=430")
}

function apare(divisoria) {
esconder()
Effect.BlindDown(divisoria)

}

function esconder() {
hide('engcivil')
hide('engelec')
hide('enginfo')
hide('engmec')
hide('engquim')
}

function hide(layer_ref) {

state = 'none';

if (document.all) { //IS IE 4 or 5 (or 6 beta)
eval( "document.all." + layer_ref + ".style.display = state");
}
if (document.layers) { //IS NETSCAPE 4 or below
document.layers[layer_ref].display = state;
}
if (document.getElementById &&!document.all) {
hza = document.getElementById(layer_ref);
hza.style.display = state;
}
}