//This program is for 2 rows and 2 columns table, using it in table2 & table4.


var do_show=0;

function show_hide_column()
{
  var stl;
  var spanWidth;
  

  if (do_show)
  { stl = 'block';
    spanWidth = '2';
    document.getElementById("HideSE").value="Hide Standard Error";
    do_show=0; //false
    

  } //if
  else
  { stl= 'none';
    spanWidth = '1';
    document.getElementById("HideSE").value="Show Standard Error";
    do_show=1; //true
    
  } //else

  

  var tbl=document.getElementById('Table2'); //retures unique element
  var rows=tbl.getElementsByTagName('tr');  // returns array of all 'tr' elements

  var celsth=rows[0].getElementsByTagName('th');  // returns array of all 'th' elements for row "0"
  celsth[0].rowSpan = spanWidth;
  celsth[1].colSpan = spanWidth;
  celsth[2].colSpan = spanWidth;

  

  var celsth=rows[1].getElementsByTagName('th');  // returns array of all 'th' elements for row "1"
  celsth[0].style.display=stl;
  celsth[1].style.display=stl;
  celsth[2].style.display=stl;
  celsth[3].style.display=stl;
  


  for (var row=2; row<rows.length;row++)
  {
  var cels=rows[row].getElementsByTagName('td');  // returns array of all 'td' elements in 'tr'
  cels[1].style.display=stl;
  cels[3].style.display=stl;
  
  }


} //end function show_hide_column