//you'll see $post_temp = query_posts(array('post_type'=>'portfolio', 'paged'=>$paged, 'p...

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//you'll see
		$post_temp = query_posts(array('post_type'=>'portfolio', 'paged'=>$paged, 
			'portfolio-category'=>$category_val, 'posts_per_page'=>$num_fetch));

//change it to 

		$post_temp = query_posts(array('post_type'=>'portfolio', 'paged'=>$paged, 
			'portfolio-category'=>$category_val, 'posts_per_page'=>$num_fetch, 'orderby'=>'title' , 'order' => 'asc'));