var startDate = new Date(2002, 2, 10);
var nowDate = new Date();

var london_imgIndex = Math.floor((nowDate-startDate)/1000); // daily increment of imgIndex by 1
var upperthames_imgIndex = london_imgIndex;

var london_imgs = new Array();
var upperthames_imgs = new Array;

var london_urls = new Array;
var upperthames_urls = new Array;

var london_alts = new Array;
var upperthames_alts = new Array;

var london_numAds = 0;
var upperthames_numAds = 0;

function london_addAdvertLink(img, alt, url)
{
    london_imgs[london_numAds] = img;
    london_urls[london_numAds] = url;
    london_alts[london_numAds++] = alt;
}

function upperthames_addAdvertLink(img, alt, url)
{
    upperthames_imgs[upperthames_numAds] = img;
    upperthames_urls[upperthames_numAds] = url;
    upperthames_alts[upperthames_numAds++] = alt;
}


function london_getImgLink()
{
if (london_imgIndex >= london_imgs.length)
	london_imgIndex -= london_imgs.length * Math.floor(london_imgIndex/london_imgs.length);

	document.write('<a href="' + london_urls[london_imgIndex] + '"><img src="' + london_imgs[london_imgIndex] + '" alt="' + 
			london_alts[london_imgIndex] +  '" border=0></a>');
}

function upperthames_getImgLink()
{
if (upperthames_imgIndex >= upperthames_imgs.length)
        upperthames_imgIndex -= upperthames_imgs.length * Math.floor(upperthames_imgIndex/upperthames_imgs.length);
	
	document.write('<a href="' + upperthames_urls[upperthames_imgIndex] + '"><img src="' + upperthames_imgs[upperthames_imgIndex] + 
	'" alt="' + upperthames_alts[upperthames_imgIndex] +  '" border=0></a>');
}

function london_getCaption()
{
if (london_imgIndex >=london_imgs.length)
	london_imgIndex -= london_imgs.length * Math.floor(london_imgIndex/london_imgs.length);

document.write('<font size="+1"><b><i>' + london_alts[london_imgIndex] + '</i></b></font>');
}

function upperthames_getCaption()
{
    if (upperthames_imgIndex >= upperthames_imgs.length)
        upperthames_imgIndex -= upperthames_imgs.length * Math.floor(upperthames_imgIndex/upperthames_imgs.length);
	document.write('<font size="+1"><b><i>' + upperthames_alts[upperthames_imgIndex] + '</i></b></font>');
}