t = setTimeout("blank_function", 1); 

arrNav = Array("about", "education", "science", "products", "news", "contact", "login"); 


function blank_function() {
}


function nav_rollover(page) { 
	clearTimeout(t);

	for(i=0; i < arrNav.length; i++) {
		nav_rollout2(arrNav[i]);
	} 

	im =  site_dir + "/images/nav/" + page + "-over.gif"; 
	$('#nav-' + page).attr("src", im); 
	pos = $('#nav-' + page).position(); 
	$('#' + page + '-dropdown').show();
	$('#' + page + '-dropdown').css({"top" : pos.top + 30, "left" : pos.left }); 

	$('#dropdown-bg').show(); 
	$('#dropdown-bg').css({"top":pos.top + 30, "left":pos.left, "height":$('#'+page+'-dropdown').height(), "width":$('#'+page+'-dropdown').width(), 'opacity':'0.8' }); 

} 

function nav_rollout(page) { 
	if($('#' + page + "-dropdown").attr("innerHTML") == "") {
		nav_rollout2(page);
	}
	else { 
		t = setTimeout("nav_rollout2('" + page + "')", 1000);
	}
} 

function nav_rollout2(page) { 
	$('#nav-' + page).attr("src", site_dir + "/images/nav/" + page + ".gif");
	$('#' + page + '-dropdown').hide();
	$('#dropdown-bg').hide(); 
}

function ppp_rollover(page) { 
	$("#"+page + '-arrow').attr("src", site_dir + "/images/nav/" + page + "-arrow.gif");
}

function ppp_rollout(page) { 
	$("#"+page + '-arrow').attr("src", site_dir + "/images/blank.gif");
}


function sub_rollover(num) {
	$('#sub-arrow' + num).attr("src", site_dir + "/images/subnav-arrow.gif"); 
}

function sub_rollout(num) {
	$('#sub-arrow' + num).attr("src", site_dir + "/images/blank.gif"); 
}


function ppp_rollover2(num, page) { 
	$('#arrow-' + num).attr("src", site_dir + "/images/" + page + "-arrow.gif");
}

function ppp_rollout2(num) {
	$('#arrow-' + num).attr("src", site_dir + "/images/blank.gif");
}