function listenNavButtons() 
{
	var prev = $( '#prev' );

	if ( prev.attr('src').indexOf( 'disabled' ) < 0 )
	{
		prev.mouseover( function() { this.src = '/i/prev_over.gif'; } ); 
		prev.mouseout( function() { this.src = '/i/prev.gif'; } ); 
	}
	var nextBut = $( '#next' );
	if ( nextBut.attr('src').indexOf( 'disabled' ) < 0 )
	{
		nextBut.mouseover( function() { this.src = '/i/next_over.gif'; } );
		nextBut.mouseout( function() { this.src = '/i/next.gif'; } ); 
	}
}