var navTimer;
var nav_texts = ['design','develop','analyze','implement','evaluate'];
var home_texts = ['default','design','develop','analyze','implement','evaluate'];


function show_nav_text(which) {
    var navText;
    for (var i=0; i < nav_texts.length; i++) {
	navText = document.getElementById('nav_text_' + nav_texts[i]);
	if (navText) {
	    navText.style.display = 'none';
	}
    }
    navText = document.getElementById('nav_text_' + which);
    if (navText) {
	navText.style.display='block';
    }
}

function show_home_text(which) {
    var homeText;
    for (var i=0; i < home_texts.length; i++) {
	homeText = document.getElementById('home_text_' + home_texts[i]);
	if (homeText) {
	    homeText.style.display = 'none';
	}
    }
    homeText = document.getElementById('home_text_' + which);
    if (homeText) {
	homeText.style.display='block';
    }
}