function flash(str,w,h,t){
  document.write('<object classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000"');
  document.write('codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=6,0,0,0" width="' + w + '" height="' + h + '" id="flash">');
  document.write('<param name=movie value="' + str + '">');
  document.write('<param name=quality value=high>');
  document.write('<param name=scale value=noborder>');
  document.write('<param name=menu value=false>');
  if (t=="true"){document.write('<param name=wmode value="transparent">');} 
    else {document.write('<param name=wmode value="opaque">');}
  document.write('<embed src="' + str + '" quality="high" scale="noborder" menu="false" name="flash"');
  if (t=="true"){document.write(' wmode="transparent" width="' + w + '" height="' + h + '" ');}
  document.write('type="application/x-shockwave-flash" pluginspage="http://www.macromedia.com/go/getflashplayer"></embed>');
  document.write('</object>');
  }


function comprobar(){
  var respuesta;
	if (document.formulario.nom.value == '') {
	  alert('Introduzca el nombre o empresa.');
	  respuesta = false;
	} else {
	  if (document.formulario.tel.value == '' &&  document.formulario.em.value == ''){
	    alert('Introduzca el teléfono o el e-mail.');
	    respuesta = false;
	  } else {
	    document.formulario.submit();
	  }
	}
	return respuesta;
	}