function sitePreloads(depth)
	{
/*	
	preload('hh',depth+'pix/hh.gif');
	preload('hh_roll',depth+'pix/hh_roll.gif');	
*/	

	preload('gnav_units','/courses/biology/images/gnav_units.gif');
	preload('gnav_units_roll','/courses/biology/images/gnav_units_roll.gif');	
	
	preload('gnav_textbk','/courses/biology/images/gnav_textbk.gif');
	preload('gnav_textbk_roll','/courses/biology/images/gnav_textbk_roll.gif');
	
	preload('gnav_case','/courses/biology/images/gnav_case.gif');
	preload('gnav_case_roll','/courses/biology/images/gnav_case_roll.gif');	
	
	preload('gnav_expert','/courses/biology/images/gnav_expert.gif');
	preload('gnav_expert_roll','/courses/biology/images/gnav_expert_roll.gif');	
	
	preload('gnav_archive','/courses/biology/images/gnav_archive.gif');
	preload('gnav_archive_roll','/courses/biology/images/gnav_archive_roll.gif');	
	
	preload('gnav_glossary','/courses/biology/images/gnav_glossary.gif');
	preload('gnav_glossary_roll','/courses/biology/images/gnav_glossary_roll.gif');	
	
	preload('gnav_search','/courses/biology/images/gnav_search.gif');
	preload('gnav_search_roll','/courses/biology/images/gnav_search_roll.gif');		
	
	preload('but_go','/courses/biology/images/but_go.gif');
	preload('but_go_roll','/courses/biology/images/but_go_roll.gif');		
	
	preload('but_next','/courses/biology/images/but_next.gif');
	preload('but_next_roll','/courses/biology/images/but_next_roll.gif');	
	
	preload('but_back','/courses/biology/images/but_back.gif');
	preload('but_back_roll','/courses/biology/images/but_back_roll.gif');	

	preload('but_home','/courses/biology/images/but_home.gif');
	preload('but_home_roll','/courses/biology/images/but_home_roll.gif');		

	preload('sb_bullet','/courses/biology/images/sb_bullet.gif');
	preload('sb_bullet_roll','/courses/biology/images/sb_bullet_roll.gif');	
	
	preload('sb_arrow','/courses/biology/images/sb_arrow.gif');
	preload('sb_arrow_roll','/courses/biology/images/sb_arrow_roll.gif');			

	}
	
function glossaryPreloads(depth)
	{
/*	
	preload('hh',depth+'pix/hh.gif');
	preload('hh_roll',depth+'pix/hh_roll.gif');	
*/	

	preload('g_but_all','/courses/biology/images/g_but_all.gif');
	preload('g_but_all_roll','/courses/biology/images/g_but_all_roll.gif');	
	preload('g_but_all_on','/courses/biology/images/g_but_all_on.gif');	
	
	preload('g_but_unit','/courses/biology/images/g_but_unit.gif');
	preload('g_but_unit_roll','/courses/biology/images/g_but_unit_roll.gif');	
	preload('g_but_unit_on','/courses/biology/images/g_but_unit_on.gif');


	}
		
function preload(imgObj,imgSrc) 
	{
	eval(imgObj+' = new Image()')
	eval(imgObj+'.src = "'+imgSrc+'"')
	}
	
	
function roll1(imageID,imageName) {
		document.images[imageID].src = eval(imageName + ".src");
	}
	
	
// popup window functions ==========================================
function popFlex(URL, winName,W,H,scroll)
	{
	if (scroll == "no")
		{scroll = "scrollbars=no"}
	else if (scroll == "yes")
		{scroll = "scrollbars"}
	window.open(URL, winName,"top=30,left=20,width="+W+",height="+H+",resizable=yes,"+scroll+"")
	}

function popGlossary(URL, scroll)
	{
	glossaryWindow = window.open(URL, "glossaryWin","top=30,left=20,width=460,height=470,resizable=yes,scrollbars=yes")
	glossaryWindow.focus()
	}
	
function popArchive(URL, scroll)
	{
	archiveWindow = window.open(URL,"archiveWin","top=60,left=50,width=730,height=470,resizable=yes,scrollbars=yes")
	archiveWindow.focus()
	}	
	
function popMain(URL)
	{
	mainWindow = window.open(URL,"mainWin","width=750,height=600,toolbar=yes,location=yes,directories=yes,menubar=yes,status=yes,resizable=yes,scrollbars=yes")
	mainWindow.focus()
	}
	
function popCasestudy(URL, scroll)
	{
	caseWindow = window.open(URL,"csWin","top=100,left=100,width=700,height=475,resizable=yes,"+scroll+"")
	caseWindow.focus()
	}	
	
		
// /popup window functions ==========================================