function get_attribute_name(){

	if(document.all) {
    	return "className";
	} else {
		return "class";
	}
}

function update_tabs(strSection){
	//disable all
	document.getElementById("info").style.display = "none";
	document.getElementById("release_notes").style.display = "none";    
	document.getElementById("installation").style.display = "none";
	document.getElementById("faq").style.display = "none";


	document.getElementById("info_btn").setAttribute(get_attribute_name(), "prop_tab_off");
	document.getElementById("release_notes_btn").setAttribute(get_attribute_name(), "prop_tab_off");
	document.getElementById("installation_btn").setAttribute(get_attribute_name(), "prop_tab_off");
	document.getElementById("faq_btn").setAttribute(get_attribute_name(), "prop_tab_off");

	//turn the selected one on
	document.getElementById(strSection).style.display = "block";
	document.getElementById(strSection + "_btn").setAttribute(get_attribute_name(), "prop_tab_on");
}