function iniCambio(){
if(this.Cambio.value=='') PantComp()}

function PantComp(){
Vieja0=window.self;
Vieja0.opener=window.self;
Ancho=screen.availWidth;
Alto=screen.availHeight;
Dir=window.location;
Nueva0=window.open(Dir, '', 
'toolbar=0,location=no,directories=0,status=0,menubar=0,'+
'scrollbars=1,resizable=0,copyhistory=1,width='+Ancho+','+
'height='+Alto+',top=0,left=0','replace');
Nueva0.Cambio.value='1';
Vieja0.close();
}

function PantNorm(){
Vieja1=window.self;
Vieja1.opener=window.self;
Dir=window.location;
Nueva1=window.open(Dir, '', 
'toolbar=1,location=1,directories=1,status=1,menubar=1,'+
'scrollbars=1,resizable=1,copyhistory=1');
Nueva1.Cambio.value='0';
Vieja1.close();
}