jQuery实现简单网页遮罩层/弹出层效果兼容IE6、IE7

/*******************************
* @name Layer跨浏览器兼容插件 v1.0
*******************************/
;(function($){
$.fn.layer = function(){
var isIE = (document.all) ? true : false;
var isIE6 = isIE && !window.XMLHttpRequest;
var position = !isIE6 ? "fixed" : "absolute";
var containerBox = jQuery(this);
containerBox.css({"z-index":"9999","display":"block","position":position ,"top":"50%","left":"50%","margin-top": -(containerBox.height()/2)+ "px","margin-left": -(containerBox.width()/2) + "px"});
var layer=jQuery("<div></div>");
layer.css({"width":"100%","height":"100%","position":position,"top":"0px","left":"0px","background-color":"#000","z-index":"9998","opacity":"0.6"});
jQuery("body").append(layer);
function layer_iestyle(){
var maxWidth = Math.max(document.documentElement.scrollWidth, document.documentElement.clientWidth) + "px";
var maxHeight = Math.max(document.documentElement.scrollHeight, document.documentElement.clientHeight) + "px";
layer.css({"width" : maxWidth , "height" : maxHeight });
}
function containerBox_iestyle(){
var marginTop = jQuery(document).scrollTop - containerBox.height()/ 2 + "px";
var marginLeft = jQuery(document).scrollLeft - containerBox.width()/ 2 + "px";
containerBox.css({"margin-top" : marginTop , "margin-left" : marginLeft });
}
if(isIE){
layer.css("filter","alpha(opacity=60)");
}
if(isIE6){
layer_iestyle();
containerBox_iestyle();
}
jQuery("window").resize(function(){
layer_iestyle();
});
layer.click(function(){
containerBox.hide();
jQuery(this).remove();
});
};
})(jQuery);

<div id="kabulore-layer">
<div class="box_container">
弹弹弹，弹走鱼尾纹~~
</div>
</div>

$("#tan").click(function(){
$("#kabulore-layer").layer();
});