window.onload = function () {
	var d = new Date();
	var hour = d.getHours();
	var ht = document.getElementById("bg");
		if (hour >=20 || hour <=6){
			ht.background = 'images/night.jpg';
		} else {
			ht.background = 'images/background.jpg';
		}	
    var header = document.getElementById('header');
	var bg = document.getElementById('contentcontainer');
    var pictures = new Array('http://www1.qcomputer.net/images/header1.png','http://www1.qcomputer.net/images/header2.png','http://www1.qcomputer.net/images/header3.png	');
	var logos = new Array('http://www1.qcomputer.net/images/logo1.JPG','http://www1.qcomputer.net/images/logo2.JPG','http://www1.qcomputer.net/images/logo3.JPG');
    var numPics = pictures.length;
    if (document.images) {
        var chosenPic = Math.floor((Math.random() * numPics));
        header.style.background = 'url(' + pictures[chosenPic] + ')';
		bg.style.background = 'url(' + logos[chosenPic] + ')';
    }
			
}