var currentPosition = 1

	function hideSponsorBanners(){
		for (var iCount=0; iCount < sponsordiv.length; iCount++){
			document.getElementById(sponsordiv[iCount]).style.display='none';
		}
	}

	function rotateSponsorBanner(){
		hideSponsorBanners();
		document.getElementById(sponsordiv[currentPosition]).style.display='block';
		currentPosition ++;
		if(currentPosition>sponsordiv.length-1){
			currentPosition = 0;
		}
	}      

	function initialiseSponsorBanners(){
    sponsordiv = new Array(2);
    sponsordiv [0] = 'keynote-sponsors';
    sponsordiv [1] = 'supporting-organisations';
	}