In this post I have explained how to select box hide concept like e-commerce website just choose an checkbox value change as select box value using java script coding and select box value disabled concept this post most help to classified and e-commerce website developers  try this simple script  take a look this live demo. 
function closed(to,day)
JavaScript
Select box and check box name call the function on  getElementById(day) select box to change loop value (to+"["+day+"][1]").value = 'Closed'; 
function closed(to,day)
  {
 if(document.getElementById(day).checked)
  {
 for(var i=1; i<=2;i++)
  {
  if(day>6)
 day = day-7;
 document.getElementById(to+"["+day+"][1]").value = 'Closed';
 document.getElementById(to+"["+day+"][2]").value = 'Closed';
  }
  }
 else
 {
  for(var i=1; i<=2;i++)
 {
  if(day>6)
  day = day-7;
  document.getElementById(to+"["+day+"][1]").value = '00:00';
  document.getElementById(to+"["+day+"][2]").value = '23:59';
 } 
 }
 }
Html
Click check box closed the select box value and disabled select box just call in  disabled="disabled" coding watch below coding  
<p><span>Monday :</span>
  <select id='time[0][1]' name='time01' >
  <option value = '00:00'> PHP </option>
  <option value = '00:00'>Javascript </option>
  <option value = '00:30'>web design </option>
  <option value = 'Closed'> Closed </option></select>
  </span>
To 
  <select id='time[0][2]' name='time02' >
  <option value = '00:00'>Database </option>
  <option value = '00:00'>validation </option>
  <option value = '00:30'>Css</option>
  <option value = 'Closed'> Closed </option></select>
  </select>  
<input type='checkbox' id='0' name='0' onClick="closed('time','0')"  class='cmn'> Closed</p>
<p><span>Monday :</span>
  <select disabled="disabled" id='time[0][1]' name='time01' >
  <option value = '00:00'> PHP </option>
  <option value = '00:00'>Javascript </option>
  <option value = '00:30'>web design </option>
  <option value = 'Closed'> Closed </option></select>
</span>
To 
  <select disabled="disabled" id='time[0][2]' name='time02' >
  <option value = '00:00'>Database </option>
  <option value = '00:00'>validation </option>
  <option value = '00:30'>Css</option>
  <option value = 'Closed'> Closed </option></select>
  </select>  
<input type='checkbox' id='0' name='0' onClick="closed('time','0')"  class='cmn'> Closed</p>
Live demo
 Display hours of operation
                  
                   Do not display hours of operation
Monday :
  
 
To 
  
    
 Closed
 
