function initBG() {
	
	var _BG = [
		'/static/images/bg-container.jpg',
		'/static/images/bg-container2.jpg',
		'/static/images/bg-container3.jpg'
	]
	
	var _randomBG = Math.floor(Math.random()* _BG.length);
	var _container = document.getElementsByTagName('div')[0];
	if (_container.className.indexOf('container') != -1) {
		_container.style.backgroundImage = 'url('+_BG[_randomBG]+')';
	}
	
}
if (window.addEventListener)
	window.addEventListener("load", initBG, false);
else if (window.attachEvent)
	window.attachEvent("onload", initBG);