function enviar(form)
{
    if ((form.uno.checked == true) && (form.cuatro.checked==false))
    {
		document.getElementById("caja1").style.opacity="1";
		document.getElementById("caja1").style.filter="alpha(opacity=100)";
    	document.getElementById("caja2").style.opacity=".50";
		document.getElementById("caja2").style.filter="alpha(opacity=50)";
		document.getElementById("caja3").style.opacity="1";
		document.getElementById("caja3").style.filter="alpha(opacity=100)";
    }
	if ((form.dos.checked == true) && (form.cuatro.checked==false))
    {
    	document.getElementById("caja1").style.opacity="1";
		document.getElementById("caja1").style.filter="alpha(opacity=100)";
    	document.getElementById("caja2").style.opacity=".50";
		document.getElementById("caja2").style.filter="alpha(opacity=50)";
		document.getElementById("caja3").style.opacity="1";
		document.getElementById("caja3").style.filter="alpha(opacity=100)";
    }
	if ((form.tres.checked == true) && (form.cuatro.checked==false))
    {
    	document.getElementById("caja1").style.opacity="1";
		document.getElementById("caja1").style.filter="alpha(opacity=100)";
    	document.getElementById("caja2").style.opacity=".50";
		document.getElementById("caja2").style.filter="alpha(opacity=50)";
		document.getElementById("caja3").style.opacity="1";
		document.getElementById("caja3").style.filter="alpha(opacity=100)";
    }
	if ((form.cinco.checked == true) && (form.cuatro.checked==false))
    {
    	document.getElementById("caja1").style.opacity="1";
		document.getElementById("caja1").style.filter="alpha(opacity=100)";
    	document.getElementById("caja2").style.opacity=".50";
		document.getElementById("caja2").style.filter="alpha(opacity=50)";
		document.getElementById("caja3").style.opacity="1";
		document.getElementById("caja3").style.filter="alpha(opacity=100)";
    }
	if (form.cuatro.checked == true)
    {
    	document.getElementById("caja1").style.opacity=".50";
		document.getElementById("caja1").style.filter="alpha(opacity=50)";
		document.getElementById("caja2").style.opacity="1";
		document.getElementById("caja2").style.filter="alpha(opacity=100)";
		document.getElementById("caja3").style.opacity=".50";
		document.getElementById("caja3").style.filter="alpha(opacity=50)";
    }
	if ((form.cuatro.checked == true) && (form.uno.checked == true) )
    {
		document.getElementById("caja1").style.opacity="1";
		document.getElementById("caja1").style.filter="alpha(opacity=100)";
		document.getElementById("caja2").style.opacity="1";
		document.getElementById("caja2").style.filter="alpha(opacity=100)";
		document.getElementById("caja3").style.opacity="1";
		document.getElementById("caja3").style.filter="alpha(opacity=100)";
    }
	if ((form.cuatro.checked == true) && (form.dos.checked == true) )
    {
		document.getElementById("caja1").style.opacity="1";
		document.getElementById("caja1").style.filter="alpha(opacity=100)";
		document.getElementById("caja2").style.opacity="1";
		document.getElementById("caja2").style.filter="alpha(opacity=100)";
		document.getElementById("caja3").style.opacity="1";
		document.getElementById("caja3").style.filter="alpha(opacity=100)";
    }
	if ((form.cuatro.checked == true) && (form.tres.checked == true) )
    {
		document.getElementById("caja1").style.opacity="1";
		document.getElementById("caja1").style.filter="alpha(opacity=100)";
		document.getElementById("caja2").style.opacity="1";
		document.getElementById("caja2").style.filter="alpha(opacity=100)";
		document.getElementById("caja3").style.opacity="1";
		document.getElementById("caja3").style.filter="alpha(opacity=100)";
    }
	if ((form.cuatro.checked == true) && (form.cinco.checked == true) )
    {
		document.getElementById("caja1").style.opacity="1";
		document.getElementById("caja1").style.filter="alpha(opacity=100)";
		document.getElementById("caja2").style.opacity="1";
		document.getElementById("caja2").style.filter="alpha(opacity=100)";
		document.getElementById("caja3").style.opacity="1";
		document.getElementById("caja3").style.filter="alpha(opacity=100)";
    }
	if ((form.cuatro.checked == false) && (form.cinco.checked == false) && (form.tres.checked == false) && (form.dos.checked == false) && (form.uno.checked == false))
    {
		document.getElementById("caja1").style.opacity=".5";
		document.getElementById("caja1").style.filter="alpha(opacity=50)";
		document.getElementById("caja2").style.opacity=".5";
		document.getElementById("caja2").style.filter="alpha(opacity=50)";
		document.getElementById("caja3").style.opacity=".5";
		document.getElementById("caja3").style.filter="alpha(opacity=50)";
    }
}