select option 默认选中

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select option 默认选中5

这个select级联菜单是通过解析xml完成的

<script type="text/javascript">	
	$(document).ready(function(){
    	$.ajax({
     		url : "${request.contextPath}/xml/address.xml",
     		success : function(xml) {
      		$(xml).find("province").each(function(){
       			var t = $(this).attr("name");  
        		$("#DropProvince").append(
         		"<option>" + t + "</option>");
       			});
       			
     		}
    	});
    
	   	//二级的菜单
	   	$("#DropProvince").change(
	    	function() {
	       		$("#sCity>option").remove();
	       		var pname = $("#DropProvince").val();
	       		$.ajax({
	        		url : "${request.contextPath}/xml/address.xml",
	        		success : function(xml){
	         			$(xml).find("province[name='" + pname+ "']>city").each(function(){
	           				var c = $(this).attr("name")
	           				$("#sCity").append("<option>"+ c + "</option>");
	         			});
	        		}
	       		});  
			}	
	    );
	    //三级的菜单  
	    $("#sCity").change(
	    	function() {
	    		$("#sAddress>option").remove();
	    		var pname1 = $("#sCity").val();
	       		$.ajax({
	        		url : "${request.contextPath}/xml/address.xml",
	        		success : function(xml) {
	         			$(xml).find("city[name='" + pname1+ "']>address").each(function(){
	         				var d = $(this).attr("name")
	            			$("#sAddress").append("<option>"+ d + "</option>");
	           			});
	        		}
	       		});
			}
	    );
 	});
</script>

下面是显示菜单

<tr>
					<td align="center">市：&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<select id="sCity" name="city"><option>请选择</option></select></td>
				</tr>
				<tr>
					<td align="center">区/县：&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<select id="sAddress" name="address"><option>请选择</option></select></td>
				</tr>

我要修改数据的时候，要把修改前的数据代出来。比如现在在数据库中查处省是黑龙江市是哈尔滨区是南岗区
怎样让select自己默认选择省市区。谢谢