if (window.screen){
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  if(w== 1024){document.write("<link rel=stylesheet href='../css/estilos1024.css'>")}
  if(w== 1152){document.write("<link rel=stylesheet href='../css/estilos1152.css'>")}
  if(w== 1280){document.write("<link rel=stylesheet href='../css/estilos2048.css'>")}
  if(w> 1280){document.write("<link rel=stylesheet href='../css/estilosplus.css'>")}
}