var allAdTags = new Array();
var adCount = 0;
var adCurrent = 0;

function initAllAdTags()
{
	allParagraphs = document.getElementsByTagName('p');
	inc = 0;

	for (i = 0; i<allParagraphs.length; i++)
	{
		if (allParagraphs[i].className == "ad")
		{
			adCount++;
			allAdTags[inc++] = allParagraphs[i];
		}
	}

	adCurrent = Math.floor ( Math.random() * adCount );
//	alert(adCurrent);
	
	showNextAd();
	
	var Timer = setInterval("showNextAd()", 10000);
}

function showNextAd()
{
	if (adCount == 0)
		return;

	allAdTags[adCurrent].style.display = 'none';
	
	adCurrent++;
		if (adCurrent >= adCount)
		adCurrent = 0;

	allAdTags[adCurrent].style.display = 'block';
}