function show_infobox(whichone, which_item){
	var whichbox = "infobox" + whichone;
	document.getElementById(whichbox).style.display = "block";
	
	var feat_item = which_item + "Button";
	document.getElementById(feat_item).src = "http://images.fastcompany.com/infographics/consumer_electronics/" + which_item + "_on.jpg";
}

function hide_infobox(whichone, which_item){
	var whichbox = "infobox" + whichone;
	document.getElementById(whichbox).style.display="none";
	
	var feat_item = which_item + "Button";
	document.getElementById(feat_item).src = "http://images.fastcompany.com/infographics/consumer_electronics/" + which_item + "_off.jpg";
}