jquery remove an change text

by chris callaghan

HTML

<select multiple id ="pa_options">
  <option value="3">asdas</option>
  <option value="4">Box efdf</option>
  <option value="4">Case ad</option>
 
 </select>
 
  <select multiple id ="pa_options">
  <option value="3">asdas</option>
  <option value="4">Case</option>
 
 </select>

JavaScript

var single = "Single"	
var ridgepack = "ridgepack"	
var box = "Box"	
var ccase = "Case"
	
jQuery('select#pa_options option:contains('+single+')').remove();
jQuery('select#pa_options option:contains('+ridgepack+')').remove();
jQuery('select#pa_options option:contains('+box+')').text('Box');
jQuery('select#pa_options option:contains('+ccase+')').text('Case');
jQuery('select#pa_options option').each(function() {
    if (jQuery(this).not(':selected')) { 
jQuery('select#pa_options option:contains('+ccase+')').prop('selected', true);

     }
});

jQuery('select#pa_options option:contains('+box+')').prop('selected', true);