nextButton = "";
	prevButton = "";
	blownUpimage = "";
	pageCount = "0";
	currentPage = "1";
	slideShow = 0;
	page = [];

	function blowUpImage(dom) {
		// ==== reset all border color to default
		for ( i=0;i<imageGroups.length;i++ ) {
			imageGroups[i].style.borderColor = "#97929a";
		}
		
		document.getElementById('blownup').src = dom.src;
		dom.parentNode.style.borderColor = "#17c4ff";
	}