function displayAd(){

	showAd();
	adIntervalId=setInterval ( "showAd()", 15000 );
}



function showAd ( )
{
var randnumber=Math.random ( )*1000;
 
randnumber=parseInt(randnumber);
var count_ads=arrAds.length;
var adindex=randnumber%count_ads;

document.getElementById("adlink").setAttribute("href",arrAds[adindex][0]);
document.getElementById("adimage").setAttribute("src",arrAds[adindex][1]);
}

var adIntervalId = 0;
var arrAds=[
['http://qualitypointtech.com/contactus.htm','images/services.gif'],
['http://qualitypointtech.net/webtimesheet/index.php','images/timesheet.gif'],
['http://qualitypointtech.net/ebook/index.php','images/ebook.jpg'],

];