function TabLon()
{//close();
  navwin=open("equivalencias/TabLong.htm","Longitud","width=628,height=300,status=NO,scrollbars=NO,border=0");}

function TabVol()
{//close();
  navwin=open("equivalencias/TabVol.htm","Volumen","width=628,height=292,status=NO,scrollbars=NO,border=0");}

function TabPeso()
{//close();
  navwin=open("equivalencias/TabPeso.htm","Peso","width=628,height=278,status=NO,scrollbars=NO,border=0");}

function TabArea()  
{//close();
  navwin=open("equivalencias/Tabarea.htm","Area","width=628,height=260,status=NO,scrollbars=NO,border=0");}

function TabTemp()  
{//close();
  navwin=open("equivalencias/TabTemp.htm","Temperatura","width=300,height=143,status=NO,scrollbars=NO,border=0");}