// Left Nav Images

var lNavBullet;

var imgItems = 	{	'pdTextImage' : {'out' : new Image, 'over' : new Image},
					'imTextImage' : {'out' : new Image, 'over' : new Image},
					'asTextImage' : {'out' : new Image, 'over' : new Image},
					'rsTextImage' : {'out' : new Image, 'over' : new Image},
					'poTextImage' : {'out' : new Image, 'over' : new Image}
				};

var lNavBullet = {	'lg' : {'out' : new Image, 'over' : new Image, 'active' : new Image},
					'sm' : {'out' : new Image, 'over' : new Image, 'active' : new Image}};
				


function preLoadImages()
{
	imgItems['pdTextImage'].over.src = "/images/lnav_pd_btn_on.gif";
	imgItems['pdTextImage'].out.src = "/images/lnav_pd_btn_off.gif";
	
	imgItems['imTextImage'].over.src = "/images/lnav_im_btn_on.gif";
	imgItems['imTextImage'].out.src = "/images/lnav_im_btn_off.gif";

	imgItems['asTextImage'].over.src = "/images/lnav_as_btn_on.gif";
	imgItems['asTextImage'].out.src = "/images/lnav_as_btn_off.gif";
	
	imgItems['rsTextImage'].over.src = "/images/lnav_rs_btn_on.gif";
	imgItems['rsTextImage'].out.src = "/images/lnav_rs_btn_off.gif";
	
	imgItems['poTextImage'].over.src = "/images/lnav_po_btn_on.gif";
	imgItems['poTextImage'].out.src = "/images/lnav_po_btn_off.gif";
	
	// Load Bullets
	lNavBullet.lg.over.src = "/images/lnav_bullet_lg_on.gif";
	lNavBullet.lg.out.src = "/images/lnav_bullet_lg_off.gif";
	lNavBullet.lg.active.src = "/images/lnav_bullet_lg_active.gif";
	
	lNavBullet.sm.over.src = "/images/lnav_bullet_sm_on.gif";
	lNavBullet.sm.out.src = "/images/lnav_bullet_sm_off.gif";
	lNavBullet.sm.active.src = "/images/lnav_bullet_sm_active.gif";
}


function swapLeftNav(navItem, action, active) {
	var documentTextImage = navItem + "_text_img";
	var documentBulletImage = navItem + "_bullet_img";
	
	var bulletSize = getBulletSize(documentBulletImage);

	if (action == 'over')
	{
		document.images[documentTextImage].src = imgItems[navItem + "TextImage"].over.src;
		document.images[documentBulletImage].src = lNavBullet[bulletSize].over.src;
	}
	if ((action == 'out') && (active == 'active'))
	{
		document.images[documentTextImage].src = imgItems[navItem + "TextImage"].out.src;
		document.images[documentBulletImage].src = lNavBullet[bulletSize].active.src;
	}
	if ((action == 'out') && (active != 'active'))
	{
		document.images[documentTextImage].src = imgItems[navItem + "TextImage"].out.src;
		document.images[documentBulletImage].src = lNavBullet[bulletSize].out.src;
	}
}


function getBulletSize(bulletName) {
	
	var returnSize;
	
	if (document.images[bulletName].height == 33)
	{
		returnSize = "lg";
	}
	else if (document.images[bulletName].height == 21)
	{
		returnSize = "sm";
	}
	return returnSize;
}