var nav_welcome_out = new Image();
var nav_agenda_out = new Image();
var nav_speakers_out = new Image();
var nav_travel_out = new Image();
var nav_sponsors_out = new Image();
var nav_buzz_out = new Image();
var nav_virtual_forum_out = new Image();
var nav_platinum_out = new Image();
var nav_gold_out = new Image();
var nav_silver_out = new Image();
var nav_video_out = new Image();
var nav_blogs_out = new Image();
var nav_whitepapers_out = new Image();

var nav_welcome_over = new Image();
var nav_agenda_over = new Image();
var nav_speakers_over = new Image();
var nav_travel_over = new Image();
var nav_sponsors_over = new Image();
var nav_buzz_over = new Image();
var nav_virtual_forum_over = new Image();
var nav_platinum_over = new Image();
var nav_gold_over = new Image();
var nav_silver_over = new Image();
var nav_video_over = new Image();
var nav_blogs_over = new Image();
var nav_whitepapers_over = new Image();

var preloaded = false;

function preloadImages()
{
	nav_welcome_out.src = "media/Images/Nav_Welcome.gif";
	nav_agenda_out.src = "media/Images/Nav_Agenda.gif";
	nav_speakers_out.src = "media/Images/Nav_Speakers.gif";
	nav_travel_out.src = "media/Images/Nav_Travel.gif";
	nav_sponsors_out.src = "media/Images/Nav_Sponsors.gif";
	nav_buzz_out.src = "media/Images/Nav_Buzz.gif";
	nav_virtual_forum_out.src = "media/Images/Nav_VirtualForum.gif";
	nav_platinum_out.src = "media/Images/SubNav_Platinum.gif";
	nav_gold_out.src = "media/Images/SubNav_Gold.gif";
	nav_silver_out.src = "media/Images/SubNav_Silver.gif";
	nav_video_out.src = "media/Images/SubNav_Video.gif";
	nav_blogs_out.src = "media/Images/SubNav_Blogs.gif";
	nav_whitepapers_out.src = "media/Images/SubNav_Whitepapers.gif"
	
	nav_welcome_over.src = "media/Images/NavOn_Welcome.gif";
	nav_agenda_over.src = "media/Images/NavOn_Agenda.gif";
	nav_speakers_over.src = "media/Images/NavOn_Speakers.gif";
	nav_travel_over.src = "media/Images/NavOn_Travel.gif";
	nav_sponsors_over.src = "media/Images/NavOn_Sponsors.gif";
	nav_buzz_over.src = "media/Images/NavOn_Buzz.gif";
	nav_virtual_forum_over.src = "media/Images/NavOn_VirtualForum.gif";
	nav_platinum_over.src = "media/Images/SubNavOn_Platinum.gif";
	nav_gold_over.src = "media/Images/SubNavOn_Gold.gif";
	nav_silver_over.src = "media/Images/SubNavOn_Silver.gif";
	nav_video_over.src = "media/Images/SubNavOn_Video.gif";
	nav_blogs_over.src = "media/Images/SubNavOn_Blogs.gif";
	nav_whitepapers_over.src = "media/Images/SubNavOn_Whitepapers.gif"

	preloaded = true;
	
	if (typeof SetNavOn == "function")
	{ 
		SetNavOn(); 
	}
	
	if (typeof SetSubNavOn == "function")
	{ 
		SetSubNavOn(); 
	}
}

window.onload = preloadImages;

function changeImage(name, state)
{
	if (preloaded)
	{
		document.getElementById(name).src = eval("nav_" + name + "_" + state + ".src");
	}
}

function sponsorsChangeImage(id, name, state)
{
	if (preloaded)
	{
		document.getElementById(id).src = eval("nav_" + name + "_" + state + ".src");
	}
}