function VentanaLogin(){
document.getElementById("showimage").style.visibility="visible";	}
var ns4=document.layers;
var ie4=document.all;
var ns6=document.getElementById&&!document.all;
function hidebox(){
crossobj=ns6? document.getElementById("showimage") : document.all.showimage;
if (ie4||ns6)
crossobj.style.visibility="hidden";
else if (ns4)
document.showimage.visibility="hide";
}
function VentanaLoginT(){
document.getElementById("showimageT").style.visibility="visible";	}
var ns4=document.layers;
var ie4=document.all;
var ns6=document.getElementById&&!document.all;
function hideboxT(){
crossobj=ns6? document.getElementById("showimageT") : document.all.showimageT;
if (ie4||ns6)
crossobj.style.visibility="hidden";
else if (ns4)
document.showimageT.visibility="hide";
}