//randomizing images on Welcome page and navigating through them
var CurrentImageNo;

var filenames=new Array("annecy2005_2","augsburg2004","grenoble1998_1","grenoble2005","kazan2014","kazan2018","kolomna2005","kyoto2006_1","kyoto2006_2","moscow2009","moscow2012","moscow2017_1","moscow2017_2","moscow2017_3","piter2007_3","piter2009","piter2013_1","piter2013_2","rome2003","salzburg2001_1","split2009","visp2010","volga2002","zuerich2010_1","zuerich2010_2","moscow2021","moscow2023_1","samarkand2023_1","kazan2023-1","kazan2023-2");

function RandomImage()
    {
    var now = new Date();
    var n;

    n=Math.floor(now.getSeconds()*filenames.length/60);
    
    if(n>filenames.length-1) n=filenames.length-1;//last picture
    ChangeImage(n);
    }

function ChangeImage(n)
    {
    var CommentText;
    CurrentImageNo=n;
    document.photo.src="images/welcome_"+filenames[n]+".jpg";
    document.photo.height=screen.height*0.6;

    if(langSelection=="rus")
        CommentText='Ôîòî ';
    else
        CommentText='Photo #';

    CommentText+=eval(n+1)+'/'+filenames.length+'('+filenames[n]+')';

    document.forms['comment'].elements['comment_text'].value=CommentText;
    document.forms['comment'].elements['comment_text'].cols=CommentText.length;
    }

function NextImage()
    {
    var n;

    n=CurrentImageNo+1;
    if(n>filenames.length-1) n=0;
    ChangeImage(n);
    }

function PrevImage()
    {
    var n;
    n=CurrentImageNo-1;
    if(n<0) n=filenames.length-1;
    ChangeImage(n);
    }