// button controllers
var oversuffix = "_on";

rollover = function( img ){
	if( !img) return false;
	var src = img.src;
	img.src = src.substring(0,src.length-4) + oversuffix +  src.substring(src.length-4, src.length) 
}
rollout = function( img ){
	if( !img) return false;
	var src = img.src;
	if( src.indexOf( oversuffix ) < 0 );
	img.src = src.substring(0,src.indexOf( oversuffix )) + src.substring(src.length-4, src.length);
}
preload = function(){
	for( var i=0; i<arguments.length; i++){
		img = new Image();
		img.src = arguments[i];
	}
}


preload( "/image/nav_press_on.gif","/image/nav_trailer.gif","/image/nav_awards.gif","/image/nav_contact_on.gif","/image/nav_vault.gif" );

t = null;
currentImg = null;

showDownload = function(pos)
{
	clearTimeout(t);
	if( typeof(pos) == "object"){currentImg = pos;return;}
	hideAllDownload();
	id = "d"+pos;
	currentImg = document.getElementById(id);
	if( currentImg == null ) return;
	currentImg.style.display = "block";
}

hideDownload = function(pos)
{
	if( typeof(pos) == "object")
	{
		hideAllDownload();
		currentImg = null;
		return;
	}
	t = setTimeout("currentImg.style.display='none'",500);
}

hideAllDownload = function()
{
	pos = 0;
	img = document.getElementById("d"+pos)
	while( img != null )
	{
		img.style.display = "none";
		img = document.getElementById("d"+ (++pos));
	}
}