function alteCatshow( id ) {
	element = document.getElementById( "section" + id );
	element.style.display='block';

	element = document.getElementById( "link" + id );
	element.style.display='none';
}

function viewAllClass( className ) {
	elements = getElementsByClassName( document, '*', className );

	for ( var i=0; i < elements.length; i++ ) {
		element = elements[ i ];
		element.style.display = 'block';
	}	

}

function hideAllClass( className ) {
	elements = getElementsByClassName( document, '*', className );

	for ( var i=0; i < elements.length; i++ ) {
		element = elements[ i ];
		element.style.display = 'none';
	}	
}