function InsertarFlash(FlashVars) {

  document.write("<object id='flash_fondo'")+
  document.write("        classid='clsid:D27CDB6E-AE6D-11cf-96B8-444553540000'")+
  document.write("        codebase='http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=8,0,0,0'")+
  document.write("        width='2500'")+
  document.write("        height='2500'>")+
  document.write("        <param name='movie' value='swf/index.swf'>")+
  document.write("        <param name='menu' value='false'>")+
  document.write("        <param name='quality' value='high'>")+
  document.write("        <param name='wmode' value='transparent'>")+
  document.write("        <param name='flashvars' value='&Width=" + document.body.clientWidth + "&Height=" + document.body.clientHeight + "&" + FlashVars + "'>");
  document.write("        <embed src='swf/index.swf'")+
  document.write("               menu='false'")+
  document.write("               quality='high'")+
  document.write("               wmode='transparent'")+
  document.write("               width='2500'")+
  document.write("               height='2500'")+
  document.write("               flashvars='&Width=" + document.body.clientWidth + "&Height=" + document.body.clientHeight + "&" + FlashVars + "'")+
  document.write("               type='application/x-shockwave-flash'") +
  document.write("               pluginspage='http://www.macromedia.com/shockwave/download/index.cgi?P1_Prod_Version=ShockwaveFlash'>")+
  document.write("        </embed>")+
  document.write("</object>");

}