function nextImage(){	
	if(window.sample) window.document["sample"].SetVariable("nextClick", "1");
	if(document.sample) document.sample.SetVariable("nextClick", "1");
}

function prevImage(){	
	if(window.sample) window.document["sample"].SetVariable("prevClick", "1");
	if(document.sample) document.sample.SetVariable("prevClick", "1");
}