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function to load javascripts, based on https://gist.github.com/getify/603980
load_script = function (url, callback) {
var oDOC = document;
var head = oDOC.head || oDOC.getElementsByTagName("head");
// loading code borrowed directly from LABjs itself
setTimeout(function () {
if ("item" in head) { // check if ref is still a live node list
if (!head[0]) { // append_to node not yet ready
setTimeout(arguments.callee, 25);
return;
}
head = head[0]; // reassign from live node list ref to pure node ref -- avoids nasty IE bug where changes to DOM invalidate live node lists
}
var scriptElem = oDOC.createElement("script"),
scriptdone = false;
scriptElem.onload = scriptElem.onreadystatechange = function () {
if ((scriptElem.readyState && scriptElem.readyState !== "complete" && scriptElem.readyState !== "loaded") || scriptdone) {
return false;
}
scriptElem.onload = scriptElem.onreadystatechange = null;
scriptdone = true;
if (typeof callback === 'function') {
callback();
}
};
scriptElem.src = url;
head.insertBefore(scriptElem, head.firstChild);
}, 0);
// required: shim for FF <= 3.5 not having document.readyState
if (oDOC.readyState == null && oDOC.addEventListener) {
oDOC.readyState = "loading";
var handler;
oDOC.addEventListener("DOMContentLoaded", handler = function () {
oDOC.removeEventListener("DOMContentLoaded", handler, false);
oDOC.readyState = "complete";
}, false);
}
};
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