Permalinks: Get query vars from custom permalinks

The code below generates content when I turn of nice url’s but when I try with apache re-write and nice permalinks it appears blank. I think this has to do with $_REQUEST[‘blog_type’]; – but I don’t know how to get the value. The url the user tries to access is: /blog_type/weather-blog/

I have different kind of blogs and need to only show one at a time…

Thanks!

<?php

	$blogtype			= $_REQUEST['blog_type'];

	$father_category 	= get_term_by('slug', $blogtype, 'blog_type');

	if($father_category->parent == 0) {

		$father_category 	= get_term_by('id', $father_category->term_id, 'blog_type', ARRAY_A);

		$tname 				= $father_category['name'];
		$tdescription 		= $father_category['description'];

	} else {

		$father_category 	= get_term_by('id', $father_category->parent, 'blog_type', ARRAY_A);

		$tname 				= $father_category['name'];
		$tdescription 		= $father_category['description'];

	}

	$total_results = $wp_query->found_posts;

?>

<?php if(is_single()) { ?>

	<!-- SINGLE BLOG POST -->
	<?php get_template_part('includes/blogs/single'); ?>

<?php } else { ?>

	<div class="col4">
		<?php get_template_part('includes/blogs/sidebar'); ?>
	</div>

	<div class="col12 floatright leftsep">
		<h2 class="wline"><?php echo $tname; ?></h2>
		<p class="col9"><?php echo nl2br($tdescription); ?></p>
	</div>

	<div class="col9 floatleft leftsep"><?php if($total_results > 3 ) { wp_pagenavi(); } ?></div>

	<div class="blogpost_children_wrapper col9 floatleft leftsep wline">

		<?php
		global $query_string;

		$query_args = explode("&", $query_string);
		$search_query = array();

		foreach($query_args as $key => $string) {
			$query_split = explode("=", $string);
			$search_query[$query_split[0]] = $query_split[1];
		} // foreach

		$search = new WP_Query($search_query);
		?>

			<?php while ( $search->have_posts() ) : $search->the_post(); ?>
				<div class="blogpost">

					<div class="header">
						<h3 class="title"><a href="<?php the_permalink(); ?>&blog_type=<?php echo $blogtype; ?>" title="Read more"><?php the_title(); ?></a></h3>
						<h4 class="date"><span><?php the_time('m/d/Y'); ?></span> posted by <?php echo get_the_author(); ?></h4>
					</div>				

					<div class="content">
						<?php the_content(); ?>
					</div>

					<div class="footer">

						<?php  echo wpfblike(); ?>

						<?php if(function_exists(getILikeThis)) getILikeThis('get'); ?>
						<div class="readmore floatright"><a href="<?php the_permalink(); ?>&blog_type=<?php echo $blogtype; ?>" title="Read more">Read More ??</a></div>
					</div>

				</div>
			<?php endwhile; ?>
	</div>

<?php } ?>