var imageArray = new Array();

imageArray[0] = "media/header_pics/1.jpg"; 
imageArray[1] = "media/header_pics/2.jpg";
imageArray[2] = "media/header_pics/3.jpg";
imageArray[3] = "media/header_pics/4.jpg";
imageArray[4] = "media/header_pics/5.jpg";
imageArray[5] = "media/header_pics/6.jpg";

function doIt()
{
	var rand = Math.floor(Math.random()*6);	// number of images		
	var imgPath = "<img src='"+imageArray[rand]+"' alt='header'>";
	
	document.getElementById("image").innerHTML = imgPath;
}