function(url, callback, doc) {
		doc = doc || document;
		
		return _.element.create({
			tag: 'script',
			properties: {
				src: url,
				async: true,
				onload: callback
			},
			inside: doc.documentElement
		});
	}
function(url, callback, doc) {
		doc = doc || document;
		
		return _.element.create({
			tag: 'script',
			properties: {
				src: url,
				async: true,
				onload: callback
			},
			inside: doc.documentElement
		});
	}
function ( url , callback , doc ) { doc = doc || document ; return _ . element . create ( { tag : 'script' , properties : { src : url , async : true , onload : callback } , inside : doc . documentElement } ) ; }
Lazy loads an external script
Lazy loads an external script
Load a script