Jquery error in the ajax output

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Javascript

Ajax

jQuery

I have made a search engine for vehicles. It has 3 dropdowns and I am using $('select').CustomSelect(); to change their styles. When I run this search engine it works fine, all good.

However when I call the same thing through AJAX on another page, it shows error on this customselect line.

<script src="jquery-1.11.0.min.js" type="text/javascript"></script>
<script>
    $(document).ready(function(){
        // callsearchengine("allproducts", "");
        $("#searchengine").load('http://www.mywebsite.com/search/allproducts.php?id='); 
    });
</script>

The $('select').CustomSelect(); line is in the allproducts.php file.

Please help!

What I have tried:

I tried all possible ways, its been days am struggling with this.