<script src='js/jquery.js' type='text/javascript'></script>
<script type="text/javascript">
		$(document).ready(function(){		
				$('#soft').click(function() {
							$.ajax({
							type: "POST",
							url: "jres2.php",
							data: "type="+1,
							success: function(html){
								$("#categories").html(html);
							}
						});
				});	
				$('#games').click(function() {
							$.ajax({
							type: "POST",
							url: "jres2.php",
							data: "type="+2,
							success: function(html){
								$("#categories").html(html);
							}
						});
				});					
	 		});				
	</script>
<input name="soft" type="button" value="софт" id="soft"/>
<input name="games" type="button" value="игры" id="games"/>
<div id="categories">
	
</div>