function origen(cual){
//alert('El Valor de cual es: '+cual+'.');
document.getElementById('video_ch').style.visibility='visible';
document.getElementById('video_ch').innerHTML='<param name="movie" value="http://www.youtube.com/v/'+cual+'&rel=1"></param><param name="wmode" value="transparent"></param><embed src="http://www.youtube.com/v/'+cual+'&hl=es&fs=1&rel=0&color1=0x3a3a3a&color2=0x999999" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="391" height="237"></embed>'
}