I'm looking for a bit of help ironing out a bug in a search form I'm working on. 

I have a form of multiple checkboxes which submits via AJAX to PHP and returns a query string for use in deep-linking. The query string is used to check checkboxes on the page that appear in the query string. 

The query string looks like this:

```
var returnedResults = #Size=35.5&Size=36&Colour=red&Material=leather

```

I have a form with a series of checkboxes like this:

```
<input type="checkbox" name="Size[]" id="35" value="35">
<input type="checkbox" name="Size[]" id="35.5" value="35.5">
<input type="checkbox" name="Size[]" id="36" value="36">
...
<input type="checkbox" name="Colour[]" id="red" value="red">
...

```

I am using jQuery's each function to loop through the checkboxes and check them if they appear in the query string:

```
$('input').each(function(){
  if (returnedResults.indexOf($(this).val()) >= 0) {
   // check the box
  }
});

```

This works fine for the most part but appears to return true for Size=35 when Size=35.5 is the only thing in the query string. ie. the checkbox with value=35 is checked when returnedResults=#Size=35.5

Is this a quirk of indexOf when dealing with decimals or is there something I'm doing wrong?

Many thanks for your help in advance.