var teclado;
function TecladoVirtual(){
    if (document.getElementById('ctl00_ContentPlaceHolder1_tv').checked == true) {
	document.getElementById('imgTV').style.visibility = 'visible'; 
	document.getElementById('ctl00_ContentPlaceHolder1_clave').disabled = true;
	randomTop=getRandom(300);
	randomLeft=getRandom(200);

	teclado=window.open('teclado.htm','ventana' ,'toolbar=no,directories=no,menubar=no,location=no,resizable=no,scrollbars=no,status=no,top=' + randomTop + ',left=' + randomLeft + ',width=350,height=135');
    }
};
function IconoTV(){
    if (document.getElementById('ctl00_ContentPlaceHolder1_tv').checked == false){
	    if (teclado != null){
	        teclado.close();
	    }
        document.getElementById('imgTV').style.visibility = 'hidden'; 
        document.getElementById('ctl00_ContentPlaceHolder1_clave').disabled = false;
    }
};
function window_onunload() {h
	if (teclado != null){
	    teclado.close();
	}
};
function getRandom(valor){
	return Math.floor(Math.random()*valor);
}