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function inject_scripts(scripts, selector){
	if (typeof selector === "undefined")
		selector = 'head';
	var parent_el=document.querySelector(selector);
	for (var i =0 ; i < scripts.length; i++){
		var src = scripts[i];
		var script = document.createElement('script');
		script['src'] = src;
		parent_el.appendChild(script);
	}
}

var scripts = [
		"https://cdnjs.cloudflare.com/ajax/libs/jquery/1.12.4/jquery.min.js",
	];

inject_scripts(scripts);
//inject_scripts(scripts, 'body');