function hide_all_divs(max_ids){
	for(x=1;x<=max_ids;x++){
		document.getElementById("data_body_" + x).style.display = "none";
		document.getElementById("data_cat_" + x).className = "col_cat";
	}
}

function collapse_features(div_id){
	hide_all_divs(27);
	document.getElementById("data_body_" + div_id).style.display = "block";
	document.getElementById("data_cat_" + div_id).className = "col_cat_down";
}