参数传递问题

Question

cblLayers.Items[cblLayers.Items.Count - 1].Attributes.Add("onclick",
                        "javascript:hMap.src=MapStream.aspx?ACTION=LAYERCONTROL&LRNAME=" + layer.name + "&TYPE=this.checked");
实现功能:点击checkbox后更换图片,可是生成的html却是这样<input id="cblLayers_0" type="checkbox" name="cblLayers:0" checked="checked" onclick="javascript:hMap.src=MapStream.aspx?ACTION=LAYERCONTROL&amp;LRNAME=compfun&amp;TYPE=this.checked;" /><label for="cblLayers_0">compfun</label>
,请诸位帮忙