//Edit this line to list all of your background images
var backgroundSrcs = new Array("/images/headBG_1.jpg","/images/headBG_2.jpg","/images/headBG_3.jpg","/images/headBG_4.jpg","/images/headBG_5.jpg")

function pickimage(){
	//This line picks an image at random from the list you entered above
	var bgimage=backgroundSrcs[(Math.round(Math.random()*(backgroundSrcs.length-1)))]
	
	//This line applies the background image to your masthead
	document.getElementById("header").style.background = "url('" + bgimage + "') no-repeat";
	}