var metadataBaseURL="http://www.epa.gov/waters/data/";
var mdWord ="_metadata.";

function openMetadata(sys, frmt)
{ var dURL="";
  var winMD;
  
	dURL=metadataBaseURL+sys+mdWord+frmt;	
	
	winMD=window.open(dURL,"MetadataWin");
	if (winMD)
	{
		winMD.focus();
	}
}