onDOMReadyLite

function onDOMReadyLite (fn) {
	var d = document;
	if (/safari/i.test(navigator.userAgent)) {
		var readystate = function () {
			if (/loaded|complete/.test(d.readyState)) {
				clearInterval(timer);
				fn();
			}
		}
		var timer = setInterval(readystate, 50);
	}
	else if (d.all && !window.opera) {
		var src = (location.protocol == 'https:') ? '://0' : 'javascript:void(0)';
		d.write('<script src="' + src + '" defer="defer" id="__tmp__"></script>');
		d.getElementById('__tmp__').onreadystatechange = function(){
			if (this.readyState == 'complete') {
				this.parentNode.removeChild(this);
				fn();
			}
		};
	}
	else {
		d.addEventListener('DOMContentLoaded', fn, false);
	}
}