var current = null;

function show(word) {
  entry = document.getElementById(word);
  if (current != null) {
    current.style.display = (current.style.display == "none" ) ? "" : "none";
  }
  entry.style.display = (entry.style.display == "none" ) ? "" : "none";
  current = entry;
}

function toggle(id) {
  element = document.getElementById(id + "-contents");
  elementLink = document.getElementById(id + "-link");
  element.style.display = (element.style.display == "none" ) ? "" : "none";
 
  if (elementLink.innerHTML == "show") {
    elementLink.innerHTML = "hide";
  }
  else {
    elementLink.innerHTML = "show";
  }
}    

// Like toggle(), but hides/shows the entire widget, not just its contents.
function toggleWidget(id) {
  element = document.getElementById(id);
  element.style.display = (element.style.display == "none" ) ? "" : "none";
}

function toggleExpand(targetID) {
    targetElement = document.getElementById(targetID);
    if (targetElement.style.display == "none") {
        document.images["img_" + targetID].src = "/img/south.gif";
        targetElement.style.display = "block";
    }
    else {
        document.images["img_" + targetID].src = "/img/east.gif";
        targetElement.style.display = "none";
    }

}

var navbarText = "Your current position in the text is marked in blue."

function showTitle(sender) {
    titleDiv = document.getElementById("navbar_title");
    titleDiv.innerHTML = navbarText + " Click to jump to <strong>"
	+ sender.title + "</strong>.";
}

function clearTitle() {
    titleDiv = document.getElementById("navbar_title");
    titleDiv.innerHTML = navbarText + " Click anywhere in the line to jump "
	+ "to another position."
}

function vocab_window() {
  var theWindow =
    window.open('','vocab','height=450,width=450,scrollbars=1,status=1,resizable=1');
  theWindow.focus();
  return theWindow;
}

var _POPUP_FEATURES = 'location=0, statusbar=0, menubar=0, width=400, height=300';

function raw_popup(url, target, features) {
  if (isUndefined(features)) {
    features = _POPUP_FEATURES;
  }
  if (isUndefined(target)) {
    target = '_blank';
  }
  var theWindow =
    window.open(url, target, features);
  theWindow.focus();
  return theWindow;
}

function link_popup(src, features) {
  var theWindow = 
    window.open(src.getAttribute('href'), src.getAttribute('target') || '_blank', features);
  theWindow.focus();
  return theWindow;
}

// For pages with multiple documents, keep a list of them so we know which one
// user has clicked on at any given time
var documents = new Array();

function addDocument(doc) {
    documents.push(doc);
}

function m(src, which, docIndex) {

    var linkText = src.getAttribute('href');
    var originalText = linkText;
    if (documents[docIndex]) {
	linkText = linkText + '&d=' + documents[docIndex];
	if (which != -1) {
	    linkText = linkText + '&i=' + which;
	}
    }

    var theWindow = openPopupWindow(linkText, 'morph');
    theWindow.focus();

    return theWindow;
}

function openPopupWindow(linkText, name) {
    var parameters = 'height=600,width=450,scrollbars=1,resizable=1';
    return window.open(linkText, name, parameters);
}

function openWordStudy(src) {
    var linkText = src.getAttribute('href');
    var theWindow = openPopupWindow(linkText, 'morph');
}

function abbrev_help() {
	var theWindow = window.open('/hopper/abbrevhelp', 'abbrevHelp',
	    'height=600,width=450,scrollbars=1,status=1,resizable=1,toolbar=1');
	theWindow.focus();
}

function showNavbar() {
    var wrapper = document.getElementById("navbar_wrapper");
    wrapper.style.display = "block";

    var placeholder = document.getElementById("navbar_placeholder");
    placeholder.style.display = "none";
}

function hideNavbar() {
    var wrapper = document.getElementById("navbar_wrapper");
    wrapper.style.display = "none";

    var placeholder = document.getElementById("navbar_placeholder");
    placeholder.style.marginBottom = "10px";
    placeholder.style.display = "block";
}

function validate_required(field,alerttxt) {
	with (field) {
		if (value==null||value=="") {
			alert(alerttxt);return false;
		}
		else {
			return true
		}
	}
}

function validate_form(thisform,field) {
	with (thisform) {
		if (validate_required(field,"Please enter a search term")==false) {
		field.focus();return false;
		}
	}
}

function checkAll (field) {
	for (var i = 0; i < field.length; i++) {
		field[i].checked = true;
	}
}

function uncheckAll (field) {
	for (var i = 0; i < field.length; i++) {
		field[i].checked = false;
	}
}

function checkRedirect() {
	var regexS = "[\\?&]redirect=true";
	var regex = new RegExp( regexS );
  	var results = regex.exec( window.location.href );
  	if (results == null)
    	return;
  	else {
  		var div = document.createElement('div');
  		div.setAttribute('id', 'redirect');
  		div.setAttribute('onclick', 'closeLayer();')
  		var message = document.createElement('p');
  		message.innerHTML = "You have been automatically redirected to the new version of our website, Perseus 4.0."
  		div.appendChild(message);
  	
  		var greekReg = new RegExp("=greek");
  		var greekResults = greekReg.exec(window.location.href);
  		if (greekResults != null) {
  			var greekMessage = document.createElement('p');
  			greekMessage.setAttribute('class', 'greek');
  			greekMessage.innerHTML = "If the results are not what you expected, you may need to reenter the Greek."
  			div.appendChild(greekMessage);
  		}

  		var close = document.createElement('p');
  		close.setAttribute('class', 'close');
  		close.innerHTML = "Click anywhere in the box to close.";
  		div.appendChild(close);
  		document.body.appendChild(div);
  	}
}

function closeLayer() {
	var div = document.getElementById('redirect');
	document.body.removeChild(div);
}

function toggleGreekDisplay(selectForm) {
    var selIndex = selectForm.selectedIndex;
    var greekDisplay = document.getElementById("enter_greek");
    if (selectForm.options[selIndex].value == "greek") {
	greekDisplay.style.display = "";
    } else {
	greekDisplay.style.display = "none";
    }
}