$(document).ready(
	function()
	{
		var block_link = $('div#block_link input.radio');
		$('div#block_link input.radio').click(
			function(e)
			{
				if ( $( this ).attr('value') == 0 )
				{
					$( 'div#first_block' ).show();
					$( 'div#second_block' ).hide();
				}
				else
				{
					$( 'div#second_block' ).show();
					$( 'div#first_block' ).hide();
				}
			}
		);
		
	}
);