function changeMessage()
{
var d1 = document.getElementById("targ");
var d2 = document.getElementById("where");
if(navigator.platform.indexOf("Win") > -1 && navigator.appName == "Microsoft Internet Explorer")
{
d1.innerHTML = "Save Target As";
}

if(navigator.platform.indexOf("Win") > -1 && navigator.appName == "Netscape")
{
d1.innerHTML = "Save Link As";
}

if(navigator.platform.indexOf("Win") > -1 && navigator.appName == "Opera")
{
d1.innerHTML = "Save Linked Content As";
}

if(navigator.appVersion.indexOf("Mac") > -1 && navigator.appName == "Netscape")
{
d1.innerHTML = "Download Linked File";
d2.style.visibility = "hidden";
}
}

var stdBrowser = (document.getElementById) ? true : false;

function popUp(evt, currElem, state) {

var popUpWin = (stdBrowser) ? document.getElementById(currElem).style : eval("document." + currElem);

if (document.all) {
popUpWin.pixelTop = parseInt(evt.y)+ 2;
popUpWin.pixelLeft = Math.max(2,parseInt(evt.x)-125);
}

else 
{
if (stdBrowser) 
{
popUpWin.top = parseInt(evt.pageY)+ 2 + "px";
popUpWin.left = Math.max(2,parseInt(evt.pageX)-125) + "px";
}

else 
{
popUpWin.top = parseInt(evt.pageY)+ 2;
popUpWin.left = Math.max(2,parseInt(evt.pageX)-125);
}
}
popUpWin.visibility = state;
}

var img1=new Image(88,31);
var img2=new Image(88,31);

img1.src="images/html_blue.png";
img2.src="images/css_blue.png";

var quiz_img=new Image(500,375);
quiz_img.src="../images/late_winter_2009_photo_quiz_alt.jpg";

function protect()
{
alert("This image is copyrighted!" + "\n\n" + "- IOS Webmaster");
return false;
}

function showWin(page, name, specs)
{
displayWin = window.open(page, name, specs);
displayWin.focus()
}

function closeWin(win)
{
window.close(win);
}

/* Names for form elements required; PayPal won't process orders correctly using generic form element names, e.g., forms[0], elements[1], etc  - IOS Webmaster */
function memCheck()
{
if(document.mem_form.amount.options[document.mem_form.amount.selectedIndex].value =="")
{
alert("You didn't choose a membership type." + "\n" + "Please go back and make a selection.");
document.mem_form.amount.focus();
return false;
}
}

function goTo(num)
{
var d = document.forms[num].elements[0];
if(d.options[d.selectedIndex].value=="")
{
alert("You must make a selection first.");
document.forms[num].elements[0].focus();
return false;
}

else
{
window.location = d.options[d.selectedIndex].value;
}
}

function toTop()
{
window.scrollTo(0,0);
}

function showImage(this_img, this_txt)
{
document.getElementById('image_display').src=this_img;
document.getElementById('image_info').innerHTML=this_txt;
}

function validInfo(blurb)
{
document.getElementById('valid_info').innerHTML=blurb;
}

function imgSwap(elem, this_img)
{
document.getElementById(elem).src=this_img;
}

function showStatus(msg)
{
window.status=msg;
return true;
}

function changeBorder(elem, specs)
{
document.getElementById(elem).style.border=specs;
}

img1 = new Image(140,183);
img1.src="images/meadowlark_magazine_cover0.gif";

img2 = new Image(140,183);
img2.src="images/meadowlark_magazine_cover1.gif";

img3 = new Image(140,183);
img3.src="images/meadowlark_magazine_cover2.gif";

img4 = new Image(140,183);
img4.src="images/meadowlark_magazine_cover3.gif";

img5 = new Image(140,183);
img5.src="images/meadowlark_magazine_cover4.gif";

img6 = new Image(140,183);
img6.src="images/meadowlark_magazine_cover5.gif";

function rotate_covers()
{
var mag_covers = new Array(6)
mag_covers[0] = img1.src;
mag_covers[1] = img2.src;
mag_covers[2] = img3.src;
mag_covers[3] = img4.src;
mag_covers[4] = img5.src;
mag_covers[5] = img6.src;
var num = Math.floor(Math.random() * 6);
document.getElementById('covers').src=mag_covers[num];
}

function addBookmark()
{
var bookmark_url="http://www.illinoisbirds.org/";
var text_description="The Illinois Ornithological Society";
if (navigator.appName=="Microsoft Internet Explorer" && parseInt(navigator.appVersion) >= 4 && navigator.platform.indexOf("Win") > -1)
{
window.external.AddFavorite(bookmark_url,text_description);
}

else
{
alert("For PC users, press the Control (Ctrl) and \"D\" keys on your keyboard to bookmark this site. For Mac users, press the Command (Apple) and \"D\" keys on your keyboard." + "\n\n" + "- IOS Webmaster");
}
}

var plus_img = new Image(9,9);
var minus_img = new Image(9,9);
plus_img.src="images/plus.gif";
minus_img.src="images/minus.gif";

var domType;
var domTypeAlt;

function toggleItem(blurb, vol_num)
{
if(document.getElementById)
{
domType = document.getElementById(blurb).style;
domTypeAlt = document.getElementById(vol_num);
}

if(document.all)
{
domType = document.all[blurb].style;
domTypeAlt = document.all[vol_num];
}

if(document.layers)
{
domType = document.layers[blurb];
domTypeAlt = document.layers[vol_num];
}

if(domType.display=="block")
{
domType.display = "none";
domTypeAlt.src = plus_img.src;
domTypeAlt.title = "Expand";
}

else
{
domType.display = "block";
domTypeAlt.src = minus_img.src;
domTypeAlt.title = "Collapse";
}
}

function showInfo(elem1, elem2, img1, img2)
{
var d1 = document.getElementById(elem1);
var d2 = document.getElementById(elem2);

if(d1.style.visibility=="visible")
{
d1.style.visibility="hidden";
d2.src=img1;
}

else
{
d1.style.visibility="visible";
d2.src=img2;
}
}

function showYr()
{
var d = new Date()
var y = d.getFullYear();
document.getElementById("copy").innerHTML=y;
}