Super tiny JS loader

loadjs.js

// {Boolean} c Condition
// {String}  f File name
var loadjs = function(c,f) {
    var l = f.length;
    if ( c && f.substring(l - 3, l) === ".js") {
        var j = document.createElement('script');
	j.type = 'text/javascript';
	j.src = f;
	j.async = false;
	if (typeof j != "undefined") {
	    var s = document.getElementsByTagName('script')[0];
	        s.parentNode.insertBefore(j, s);
	}
    }
};