Display Blog Posts on main Site

Hi,
I am usinga custom Cms for my site and have wordpress as a blog. I want to fetch posts from wordpress blog into my main site according to category.
For Instance,
I have a service name tattoos on my main site and I have created the same category of tatoos in the blog. So I want to fetch the posts from tattoos and display that on my main site

<?php $arra=explode('-',$_GET['page_url']);
			$test=implode(' ',$arra);

			$SQL = "select <code>post_content</code>, <code>post_title</code>,<code>post_name</code> from <code>blog_posts</code> WHERE  <code>post_type</code>='post' and <code>post_status</code>='publish' and ( post_content like '%".ucfirst($test)."%' or post_title like '%".ucfirst($test)."%') order by <code>post_date</code>";

		if($parent_url == "services")
		{
			//echo 'pageurl==='.$page_url.'----';
			$sql_1  	= "SELECT term_id  FROM <code>blog_terms</code>  where slug like '%".$page_url."%'";

$sql_1.'<br><br>';
	$data_1 	= $objDB->setQuery($sql_1);
			$data_res	= $objDB->select();

			$where_clause_1 = array();
			$c = 0;
			for($i=0;$i<count($data_res);$i++)
			{
				$where_clause_1[] = " <code>term_taxonomy_id</code>='".$data_res[$i]['term_id']."' ";
				$c++;
			}
			if($c > 0){
				$where_clause_2 =" and ( ". implode(" or ",$where_clause_1)." ) ";
			}
			$SQL = "select <code>post_content</code>, ID, <code>post_title</code>,<code>post_name</code> from <code>blog_posts</code>  AS bp, blog_term_relationships AS btr WHERE bp.ID = btr.object_id and <code>post_type</code>='post' ".$where_clause_2." and <code>post_status</code>='publish' order by rand() limit 0,4";

		}

			$objDB->setQuery($SQL);
			$rs_blog=@$objDB->select();
			for($i=0;$i<count($rs_blog);$i++)
			{
			?>
			<li> <strong><?php echo $rs_blog[$i]['post_title'];?></strong> <?php echo substr(strip_tags($rs_blog[$i]['post_content']),0,100);?>...</li>
			<?php
			}
			?>

This is the code. It displays the post but not according to categories. PLs help me someone its urgent.