[Solved]-TypeError: $(...).highcharts is not a function-Highcharts

you are using highcharts before you added it to the page. the includes need to come before!

any order of placing js files wrong..?

yes. your highcharts setup code needs to come after the script tags that loads the highcharts library.

<script type="text/javascript" src="js/highcharts1/highcharts-2.3.5.js"></script>
<script type="text/javascript" src="js/highcharts1/modules/exporting-2.3.5.js"></script>
<script>
    function buildhighcharts(){ ... }
</script>