Explorer jquey issue - not always working

JavaScript
1

In firefox and Chrome its working perfect
but when im using Explorer 9/8
the following script isn’t always working (only if i refresh the page a few times)

i’ve added the $.ajaxSetup({ cache: false}); statement since it wasn’t working even in explorer 9 without that statement…
how can i fix this annoying error? i am using jQuery 1.2.6 (and i can’t update).

	<script type="text/javascript">
		$.ajaxSetup({ cache: false});
		
		function ajax_load(_tag)
		{
			$.get("<?php echo $this->ajax_url; ?>", { <?php echo $this->ajax_get_string; ?>, tag: _tag.slice(1) },
		   		function(data){
		   	 		 $(".content").html(data);
		  	 	});
		}
	
		temp_tag = window.location.hash;
		
		var _tag="#content";
		if (window.location.hash.length > 0) {
			$(_tag).removeClass("selected");
			_tag = window.location.hash;
			$(_tag).addClass("selected");
		}
		ajax_load(_tag);
		
		$('.tab-menu li a').click(function() {
			$(_tag).removeClass("selected");
			$(this).addClass("selected");
			_tag = $(this).attr('href');
			ajax_load(_tag);
		});
	</script>
2

When you say it isn’t working, what do you mean? What are you expecting, and what happens instead?