// JavaScript Document

var image_array 	= new Array();
var ran_number 		= Math.round(Math.random()*5) + 1; 
var counter 			= ran_number;
var initial_img		= (counter > 1) ? counter - 1 : 6;

// Try to preload the next image each time
var preload = new Image();
preload.src = 'images/headers/' + counter + '.jpg';

function initHeader() {

	setTimeout("rotateHeader()", 4000); 
	
}

function rotateHeader() {

	var header_image = document.getElementById('header_img');
	
	if (header_image) {
		header_image.src = 'images/headers/' + counter + '.jpg';
		counter = (counter < 6) ? counter + 1 : 1;
		preload.src = 'images/headers/' + counter + '.jpg';
	}
	
	setTimeout("rotateHeader()", 4000);
	
}

function displayGraphic() {
	// Random image when page first loads
	document.write('<div id="header"><img src="images/headers/' + initial_img + '.jpg" alt="Vivenda Miranda" name="header_img" width="900" height="200" id="header_img" /></div>');
}