var popup;
var largerWin;
var scrnwidth=screen.width;
var scrnheight=screen.height;
// "only 1 open at a time" popup function //
function PopUp(url,width,height,addloptions){
var xspot=Math.round((scrnwidth/2)-(width/2));
var yspot=Math.round((scrnheight/2)-(height/2));
features = addloptions+"height="+height+",width="+width+",top="+yspot+",screenY="+yspot+",left="+xspot+",screenX="+xspot;
if (!popup || popup.closed){
popup = window.open(url, '', features);
}
else {
window.popup.close();
popup = window.open(url, '', features);
}
}
// Function to View Larger Image.
// Opens window which contains ONLY a 480 x 500 image
function openLarger(imgurl,imgalt) {
var xspot=Math.round((scrnwidth/2)-(480/2));
var yspot=Math.round((scrnheight/2)-(500/2));
if (!largerWin || largerWin.closed) {
largerWin = window.open("","","width=480,height=500,top="+yspot+",screenY="+yspot+",left="+xspot+",screenX="+xspot);
}
else {
window.largerWin.close();
largerWin = window.open("","","width=480,height=500,top="+yspot+",screenY="+yspot+",left="+xspot+",screenX="+xspot);
}
drawstr = '';
drawstr += ''+imgalt+'';
drawstr += '';
drawstr += '
';
drawstr += '';
largerWin.document.open();
largerWin.document.write(drawstr);
largerWin.document.close();
}
function closepopups(){
if (popup && popup.open){
window.popup.close();
}
if (largerWin && largerWin.open){
window.largerWin.close();
}
}