var prev_id = "thm_1";
  
  function magnify(thm_id, page)
  { 
     switch (prev_id)
   	 {
	 case "thm_1":
	     	ReplaceElementID("http://www.woodshedpercussion.com/php/magnify.php?clear=1&page=" + page + "&id_num=1&modify=thumb","thm_1");
	        break;
	 case "thm_2":
	        ReplaceElementID("http://www.woodshedpercussion.com/php/magnify.php?clear=1&page=" + page + "&id_num=2&modify=thumb","thm_2");
	        break;
	 case "thm_3":
	        ReplaceElementID("http://www.woodshedpercussion.com/php/magnify.php?clear=1&page=" + page + "&id_num=3&modify=thumb","thm_3");
	        break;
	 case "thm_4":
	        ReplaceElementID("http://www.woodshedpercussion.com/php/magnify.php?clear=1&page=" + page + "&id_num=4&modify=thumb","thm_4");
	        break;
	 case "thm_5":
	        ReplaceElementID("http://www.woodshedpercussion.com/php/magnify.php?clear=1&page=" + page + "&id_num=5&modify=thumb","thm_5");
	        break;
	 case "thm_6":
	        ReplaceElementID("http://www.woodshedpercussion.com/php/magnify.php?clear=1&page=" + page + "&id_num=6&modify=thumb","thm_6");
	        break;
	 }	
	 
   	 switch (thm_id)
   	 {
   	 case "thm_1":
	     	ReplaceElementID("http://www.woodshedpercussion.com/php/magnify.php?clear=0&page=" + page + "&id_num=1&modify=thumb","thm_1");
	        ReplaceElementID("http://www.woodshedpercussion.com/php/magnify.php?clear=0&page=" + page + "&id_num=1&modify=medium","medium");
	        break;
	 case "thm_2":
	        ReplaceElementID("http://www.woodshedpercussion.com/php/magnify.php?clear=0&page=" + page + "&id_num=2&modify=thumb","thm_2");
	        ReplaceElementID("http://www.woodshedpercussion.com/php/magnify.php?clear=0&page=" + page + "&id_num=2&modify=medium","medium");
	 		break;
	 case "thm_3":
	        ReplaceElementID("http://www.woodshedpercussion.com/php/magnify.php?clear=0&page=" + page + "&id_num=3&modify=thumb","thm_3");
	        ReplaceElementID("http://www.woodshedpercussion.com/php/magnify.php?clear=0&page=" + page + "&id_num=3&modify=medium","medium");
	 		break;
	 case "thm_4":
	        ReplaceElementID("http://www.woodshedpercussion.com/php/magnify.php?clear=0&page=" + page + "&id_num=4&modify=thumb","thm_4");
	        ReplaceElementID("http://www.woodshedpercussion.com/php/magnify.php?clear=0&page=" + page + "&id_num=4&modify=medium","medium");
	 		break;
	 case "thm_5":
	        ReplaceElementID("http://www.woodshedpercussion.com/php/magnify.php?clear=0&page=" + page + "&id_num=5&modify=thumb","thm_5");
	        ReplaceElementID("http://www.woodshedpercussion.com/php/magnify.php?clear=0&page=" + page + "&id_num=5&modify=medium","medium");
	 		break;
	 case "thm_6":
	        ReplaceElementID("http://www.woodshedpercussion.com/php/magnify.php?clear=0&page=" + page + "&id_num=6&modify=thumb","thm_6");
	        ReplaceElementID("http://www.woodshedpercussion.com/php/magnify.php?clear=0&page=" + page + "&id_num=6&modify=medium","medium");
	 		break;
	 }	
	 prev_id = thm_id;
  }