Espero que te sirva de esta manera  
:
			
:Código [Seleccionar] 
 function sCategorias( $sColumnas )
 {
   $sHTML   = "";
   $sSQL    = "";
   $sQuery  = ""; 
   # QUERY
   $sSQL   = "SELECT categoria, imgurl FROM categoria;";
   $sQuery = sExecQuery( $sSQL );
 
   # HTML
   $sHTML .= "<table border='1'>";
  
    $i = 1;
   while( $sRows = mysql_fetch_array( $sQuery)){
   if($i==1){$sHTML .= '<tr>';}
     
	 $sHTML .= "<td>".$sRows['categoria']."<br><img src='".$sRows['imgurl']."'></td>";
	 
	 if($i==$sColumnas){$sHTML .= '</tr>';$i=0;}
     $i++;
	 }//end while
   $sHTML .= "</table>";
   return $sHTML;
 }
 
 print sCategorias( 2 );