Untitled

function loadScript(loc, cb) {
    var scriptdone = false,
		a = document.createElementNS && document.documentElement.namespaceURI,
        a = a ? document.createElementNS(a, "script") : document.createElement("script");
    a.setAttribute("src", loc);
	a.onload = a.onreadystatechange = function () {
		if ((a.readyState && a.readyState !== "complete" && a.readyState !== "loaded") || scriptdone) {
			return false;
		}
		a.onload = a.onreadystatechange = null;
		scriptdone = true;
		cb();
	};
    (document.getElementsByTagName("head")[0] || document.getElementsByTagName("body")[0]).appendChild(a);
};

alert('before loadScript');
loadScript('http://ajax.googleapis.com/ajax/libs/jquery/1.7/jquery.min.js', function() {
	
	alert('jquery loaded.. ');
});