function cambia_img(id, imagen)
{
	document.getElementById(id).src = imagen;
}
function cambia_td(id)
{
	if(document.getElementById(id).bgColor == "#F2F2F2")
		document.getElementById(id).bgColor = "#000000"
	else
		document.getElementById(id).bgColor = "#F2F2F2";
}
function mostrar()
{
	document.getElementById('tira').style.visibility='visible';
	document.getElementById('peque').style.visibility='hidden'
}
function ocultar()
{
	document.getElementById('tira').style.visibility='hidden';
	document.getElementById('peque').style.visibility='visible';
}
function email()
{
	document.getElementById('comparte').style.visibility='visible';
}