function checkBrowser () {
	if (document.getElementById)  {
		// browser implements part of W3C DOM HTML
		// Gecko, Internet Explorer 5+, Opera 5+
		var browser = "good";
	}
	else if (document.all)  {
		// Internet Explorer 4 or Opera with IE user agent
		var browser = "ie4";
	}
	else if (document.layers) {
		// Navigator 4
		var browser = "net4";
		location.href = "oldbrowser.html";
	}
}
//----------------------------------------------------------------------
// Function to build navigation menu
//----------------------------------------------------------------------
function buildNav() {
	var txt = '<table  border="0" cellspacing="0" cellpadding="0"  id="navigation">';
	txt += '<tr><td>&nbsp;</td></tr><tr>';

	if (thisPage==0) 
		txt += '<td><div>Home</div></td></tr><tr>';
	else
		txt += '<td><a href="index.html">Home</a></td></tr><tr>';

	if (thisPage==1)
		txt += '<td><div>About DIP</div></td></tr><tr>';
	else
		txt += '<td><a href="about.html">About DIP</a></td></tr><tr>';

	if (thisPage==7)
		txt += '<td><div>About Tanzania</div></td></tr><tr>';
	else
		txt += '<td><a href="tanzania.html">About Tanzania</a></td></tr><tr>';

	if (thisPage==3)
		txt += '<td><div>Goals</div></td></tr><tr>';
	else
		txt += '<td><a href="goals.html">Goals</a></td></tr><tr>';

	txt += '<td><a href="mushrooms.html" id="programs" onclick="showHide();" style="cursor:pointer; cursor:hand">Programs</a>';
	txt += '<div id="sub" style="display:none; padding:0; margin-top:-5px"><table cellpadding="0" cellspacing="0" border="0" id="subNav"><tr>';
	if (subPage==1)
		txt += '<td id="subNavOff"><span style="padding-left:10px">Mushroom Production</span></td></tr><tr>';
	else
		txt += '<td><a href="mushrooms.html">Mushroom Production</a></td></tr><tr>';
	if (subPage==2)
		txt += '<td id="subNavOff"><span style="padding-left:10px">Safaris, Language and</span><br><span style="padding-left:10px">Culture Orientation</span></td></tr><tr>';
	else
		txt += '<td><a href="culture.html">Safaris, Language and Culture Orientation</a></td></tr><tr>';
	if (subPage==3)
		txt += '<td id="subNavOff"><span style="padding-left:10px">Sustainable Agriculture</span><br><span style="padding-left:10px">and Environmental</span><br><span style="padding-left:10px">Conservation</span></td></tr><tr>';
	else
		txt += '<td><a href="environment.html">Sustainable Agriculture and Environmental Conservation</a></td></tr><tr>';
	if (subPage==4)
		txt += '<td id="subNavOff"><span style="padding-left:10px">Intergenerational</span><br><span style="padding-left:10px">Program</span></td></tr>';
	else
		txt += '<td><a href="intergeneration.html">Intergenerational Program</a></td></tr>';

	txt += '</table></div></td></tr><tr>';

	if (thisPage==4)
		txt += '<td><div>Accomplishments</div></td></tr><tr>';
	else
		txt += '<td><a href="accomplishments.html">Accomplishments</a></td></tr><tr>';

	if (thisPage==5)
		txt +=  '<td><div>Testimonials</div></td></tr><tr>';
	else
		txt += '<td><a href="testimonials.html">Testimonials</a></td></tr><tr>';

	if (thisPage==8)
		txt +=  '<td><div>Photos</div></td></tr><tr>';
	else
		txt += '<td><a href="photos.html">Photos</a></td></tr><tr>';

	if (thisPage==6)
		txt += '<td><div>Contact</div></td></tr></table>';
	else
		txt += '<td><a href="contact.html">Contact</a></td></tr></table>';
	return(txt);
}

//----------------------------------------------------------------------
// Function to show or hide sub-navigation under "programs"
//----------------------------------------------------------------------
function showHide() {
	if (document.getElementById)
		var switchId = document.getElementById("sub");
	else if (document.all)
		var switchId = document.all("sub");
		
    if (menuStatus == 'show') {
		document.getElementById("programs").className="";
    	switchId.style.display = "none";
        menuStatus = 'hide';
    }
	else {
		document.getElementById("programs").className="prog";
        switchId.style.display = "block";
        menuStatus = 'show';
    }
}

//----------------------------------------------------------------------
// Function to reload page
//----------------------------------------------------------------------
function MM_reloadPage(init) {  //reloads the window if Nav4 resized
  if (init==true) with (navigator) {if ((appName=="Netscape")&&(parseInt(appVersion)==4)) {
    document.MM_pgW=innerWidth; document.MM_pgH=innerHeight; onresize=MM_reloadPage; }}
  else if (innerWidth!=document.MM_pgW || innerHeight!=document.MM_pgH) location.reload();
}

//----------------------------------------------------------------------
// open a new window
//----------------------------------------------------------------------
function targetBlank (url) {
  blankWin = window.open(url,'_blank','menubar=yes,toolbar=yes,location=yes,directories=yes,fullscreen=no,titlebar=yes,hotkeys=yes,status=yes,scrollbars=yes,resizable=yes');
}