if (isset($_REQUEST['SubmitSearch'])) { 
	
	# Init SQL search filter. 
	$SearchQuery = ""; 
	
	# Which fields are we searching on? 
	if (isset($_REQUEST['Search_Fields']) && ! empty($_REQUEST['Search_Terms'])) { 
	
		// These are values from the drop-down box, a.k.a. <select> 
		if ($_REQUEST['Search_Fields'] == "all") { 
			
			$tmp_terms = mysql_real_escape_string($_REQUEST['Search_Terms']);
			
			$terms = explode(" ", $tmp_terms);			
			foreach ($terms as $term)
			{
				$SearchQuery .= "dl_rtitle LIKE '%". $term ."%' OR ";  
				$SearchQuery .= "dl_rauthor LIKE '%". $term ."%' OR ";  
				$SearchQuery .= "dl_rsource LIKE '%". $term ."%' OR ";  
				$SearchQuery .= "dl_rdate LIKE '%". $term ."%' OR ";   
				$SearchQuery .= "dl_rurl LIKE '%". $term ."%' OR ";  
				$SearchQuery .= "dl_rpublisher LIKE '%". $term ."%' OR ";  
				$SearchQuery .= "dl_risbn LIKE '%". $term ."%' OR "; 
			}			
		} elseif ($_REQUEST['Search_Fields'] == "title") { 
			$SearchQuery .= "dl_rtitle LIKE '%". trim($_REQUEST['Search_Terms']) ."%' OR ";
		} else if ($_REQUEST['Search_Fields'] == "author") { 
			$SearchQuery .= "dl_rauthor LIKE '%". trim($_REQUEST['Search_Terms']) ."%' OR ";  
		} else if ($_REQUEST['Search_Fields'] == "source") { 
			$SearchQuery .= "dl_rsource LIKE '%". trim($_REQUEST['Search_Terms']) ."%' OR ";  
		} else if ($_REQUEST['Search_Fields'] == "year") { 
			$SearchQuery .= "dl_rdate LIKE '%". trim($_REQUEST['Search_Terms']) ."%' OR ";  
		} else if ($_REQUEST['Search_Fields'] == "url") { 
			$SearchQuery .= "dl_rurl LIKE '%". trim($_REQUEST['Search_Terms']) ."%' OR ";  
		} else if ($_REQUEST['Search_Fields'] == "publisher") { 
			$SearchQuery .= "dl_rpublisher LIKE '%". trim($_REQUEST['Search_Terms']) ."%' OR ";  
		} else if ($_REQUEST['Search_Fields'] == "isbn") { 
			$SearchQuery .= "dl_risbn LIKE '%". trim($_REQUEST['Search_Terms']) ."%' OR ";  
		} 
		
		$SearchQuery = "(". substr($SearchQuery, 0, strlen($SearchQuery) - 3) .")"; 
		
		
		// These are values from the radio buttons. 
		if (isset($_REQUEST['Search_by_Type'])) { 
				
			$SearchQueryType="";
			
			if ($_REQUEST['Search_by_Type'] == "documents") { 
				foreach (array("doc", "txt", "pdf") as $type) { 
					$SearchQueryType .= " dl_rformat = '". $type ."' OR ";  
				} 
			} else if ($_REQUEST['Search_by_Type'] == "publications") { 
				foreach (array("doc", "txt", "pdf", "rtf", "ppt") as $type) {
					$SearchQueryType .= " dl_rformat = '". $type ."' OR ";  					
				}
			
			} else if ($_REQUEST['Search_by_Type'] == "images") { 
				foreach (array("jpg", "gif") as $type) {
					$SearchQueryType .= " dl_rformat = '". $type ."' OR ";
				}
			} else if ($_REQUEST['Search_by_Type'] == "video") { 
				foreach (array("mpg" , "avi", "mov", "mpeg") as $type) {
					$SearchQueryType .= " dl_rformat = '". $type ."' OR ";
				}
			} else if ($_REQUEST['Search_by_Type'] == "audio") { 
				foreach (array("mp3") as $type) {
					$SearchQueryType .= " dl_rformat = '". $type ."' OR ";
				}
			} 
			
			$SearchQueryType = substr($SearchQueryType, 0, strlen($SearchQueryType) - 4);
			$SearchQuery = $SearchQuery . " AND (" . $SearchQueryType . ")";
					
		} 

}