var currid = "sala";
function showImg( id )
{
	if (id==currid) return;
	
	document.getElementById("i"+currid).className = "";
	
	currid=id;
	
	document.getElementById("i"+currid).className = "selected";
	
	document.getElementById('preview_img').src = "images/apartamento-tulipamar-"+id+".jpg";
}