Add options to a DropDownList using jQuery in Code Igniter

[Mephist0]

I'm looking for a way to add a custom option to a drop down select list with Jquery. So the user would click the drop down, and be presented with a list of options, the last being 'add other...' once they click this they can then enter an option of their own (through a pop up, popover, directly inline or however.)There's the post below that explains it, however, I'm using CI which has the options as an array etc. How can I apply this in Code Igniter?http://stackoverflow.com/questions/317095/how-do-i-add-options-to-a-dropdownlist-using-jqueryThanks!p.s. My js knowledge isn't great.