function toggleLayer(whichLayer) {
	if (document.getElementById) {
		var style2 = document.getElementById(whichLayer).style;
		style2.display = style2.display? "":"block";
	}
	else if (document.all) {
		// this is the way old msie versions work
		var style2 = document.all[whichLayer].style;
		style2.display = style2.display? "":"block";
	}
	else if (document.layers) {
		// this is the way nn4 works
		var style2 = document.layers[whichLayer].style;
		style2.display = style2.display? "":"block";
	}
}


function randomPhoto(num_photos) {
	// random().[(max # - 1) + 1]
	var random_num = (Math.round((Math.random() * (num_photos - 1))+1));
	//alert(random_num);
	document.write('<xsl:variable name="random_photo">'+ random_num +'</xsl:variable>');
}

function redirectMyNews() {
	selected_index = document.my_news.category.selectedIndex;
	tag = document.my_news.category.options[selected_index].value;
	if (tag == 'Select News By Topic') {
		alert("Please select a topic");
	}
	else {
		window.location= 'http://www.vanderbilt.edu/news/releases?xtags=' + tag + '&limit=50';
	}
}

function showTab(_tab) {
	for (var i = 2; i < 13; i++) {
		var tab = document.getElementById('tab_' + i);
		var tabContent = document.getElementById('tab_content_' + i);
		if (tab && tabContent) {
			if (i == Number(_tab)) {
				tabContent.style.display = 'block';
				tab.style.backgroundColor = '#C8E2E2';
			} else {
				tabContent.style.display = 'none';
				tab.style.backgroundColor = '';
			}
		}
	}
}

function swapCalendarDiv() {
	var today_cal = document.getElementById('today_cal');
	var upcoming_cal = document.getElementById('upcoming_cal');
	
	if (today_cal.style.display == 'none') {
		today_cal.style.display = 'block';
		upcoming_cal.style.display = 'none';
	}
	else {
		today_cal.style.display = 'none';
		upcoming_cal.style.display = 'block';
	}
}

function display_todays_date() {
	var today = new Date();
	var numerical_day=today.getDay();
	var numerical_month=today.getMonth();
	var date=today.getDate();
	var year=today.getFullYear();
	var hr=today.getHours();
	var min=today.getMinutes();
	
	if (min < 10) {
		min = "0" + min;
	}
	
	// am / pm
	if (hr > 11) {
		min += ' p.m.';
	} else {
		min += ' a.m.';
	}
	
	if (hr > 12){
		hr = hr - 12;
	}
	
	var weekday_array = new Array('Sunday','Monday','Tuesday','Wednesday','Thursday','Friday','Saturday');
	var day_of_the_week = weekday_array[numerical_day];
	
	var month_array = new Array('January','February','March','April','May','June','July','August','September','October','November','December');
	var month_name = month_array[numerical_month];
	
	var date_string='<div class="date">' +day_of_the_week+', '+month_name+' '+date+', '+year+' '+hr+':'+min+'</div>';
	document.write(date_string);
}

function displayClassifieds(tag_name) {

	alert('tag name: '+ tag_name);

	// look up old tag name
	var variable_div = document.getElementById('last_tag');
	var old_tag = variable_div.innerHTML;
	alert('old tag: '+ old_tag);

	// hide old tag's DIV
	if (old_tag) {
		var old_tag_id = document.getElementById(old_tag);
		old_tag_id.style.display = 'none';
	}

	// update last_tag placeholder
	variable_div.innerHTML = tag_name;
	alert('new variable'+ variable_div.innerHTML);

	// display new tag
	var selected_id = document.getElementById(tag_name);
	selected_id.style.display = 'block';
	
}

function displayClassifieds2(element) {

	// look up new tag name
	var tag_name = element.options[element.selectedIndex].value;

	if (tag_name == 'undefined') {
		alert("new tag name");
		tag_name = element.options.value;
	}
	
	//alert('tag name: '+ tag_name);

	// look up old tag name
	var variable_div = document.getElementById('last_tag');
	var old_tag = variable_div.innerHTML;
	//alert('old tag: '+ old_tag);

	// hide old tag's DIV
	if (old_tag) {
		var old_tag_id = document.getElementById(old_tag);
		old_tag_id.style.display = 'none';
	}

	// update last_tag placeholder
	variable_div.innerHTML = tag_name;
	//alert('new variable div'+ variable_div);

	// display new tag
	var selected_id = document.getElementById(tag_name);
	selected_id.style.display = 'block';
	
}

function changeLocation(menuObj) {
	var i = menuObj.selectedIndex;
	if (menuObj.options[i].value) {
		window.location = menuObj.options[i].value;
	}
	else {
		return false;
	}
}

function selectSearch(target) {
	
	//var myvu_search = document.getElementById('myvu_search');
	//var vu_search = document.getElementById('vu_search');
	
	if (target == "vu_search") {
		//myvu_search.style.class = '';
		//vu_search.style.class = 'selected';
		document.getElementById("myvu_search").setAttribute("class", "deselected");
		document.getElementById("vu_search").setAttribute("class", "selected");
		document.search_form.sitesearch.value = '';
	}
	
	if (target == "myvu_search") {
		//myvu_search.style.class = 'selected';
		//vu_search.style.class = '';
		document.getElementById("vu_search").setAttribute("class", "deselected");
		document.getElementById("myvu_search").setAttribute("class", "selected");
		document.search_form.sitesearch.value = "http://www.vanderbilt.edu/myvu";
	}
	
}