function Login(){
var done=0;

var username=document.login.username.value;
username=username.toLowerCase();

var password=document.login.password.value;
password=password.toLowerCase();

if (username=="000" && password=="000") { window.location="todo_2010.htm"; done=1; }
if (username=="gral"&& password=="gral2010") { window.location="gral2060.htm"; done=1; }
if (username=="pree"&& password=="pree3050") { window.location="pree2070.htm"; done=1; }
if (username=="prim"&& password=="prim5070") { window.location="prim2080.htm"; done=1; }
if (username=="sec"&& password=="sec3090") { window.location="sec2090a.htm"; done=1; }
if (done==0) { alert("Clave incorrecta"); }
if (done==1) { alert("Clave correcta de clic para comenzar"); }
}