function show_spectrum(id,exp_id,spectrum,jdxfile,lang){
  var url = "interactive_spectrum.php?substance=" + id + "&exp_id=" + exp_id + "&spectrum=" + spectrum + "&jdxfile=" + jdxfile + "&lang=" + lang;
  spectrum_w=window.open(url,"substance","width=1014,height=750,screenX=0,screenY=0,left=0,top=0,resizable=yes");
  spectrum_w.moveTo(0,0);
  spectrum_w.focus();
}