function hideLevel( _levelId) {
	var thisLevel = document.getElementById( _levelId );
	thisLevel.style.display = "none";
}
	
function hideAll(level, sub) {
	hideLevel("specs");
	hideLevel("relations");
	hideLevel("soap");
	hideLevel("rscs");
	hideLevel("support");
	hideLevel("links");
	hideLevel("tools");
	if(level != '') {
		showLevel(level);
	}
	if(sub != '') {
		showLevel(sub);
	}
}
	
function showLevel( level ) {
	if(level) {
		thisLevel = document.getElementById( level );
		if ( thisLevel.style.display == "none") {
			thisLevel.style.display = "block";
		}
		else {
			thisLevel.style.display = "none";
		}
	}
}