check if jquery has been loaded, then load it if false

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Maybe something like this:

<script>
if(!window.jQuery)
{
   var script = document.createElement('script');
   script.type = "text/javascript";
   script.src = "https://stackoverflow.com/questions/1828237/path/to/jQuery";
   document.getElementsByTagName('head')[0].appendChild(script);
}
</script>

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