基于jquery的页面划词搜索JS

代码如下：

//划词搜索 
var GLS = {}; 
GLS.startObj = null; 
GLS.isdb = false; 
GLS.allow = true; 
GLS.isallow = function() { 
if (GLS.allow) { 
GLS.allow = false; 
alert('Google搜索已关闭'); 
} 
else { 
GLS.allow = true; 
alert('Google搜索已打开'); 
} 
}; 
GLS.dblclick = function() { 
GLS.isdb = true; 
}; 
GLS.mousedown = function(evt) { 
evt = (evt) ? evt : ((window.event) ? window.event : ""); 
if (evt) { 
GLS.startObj = (evt.target) ? evt.target : evt.srcElement; 
} 
}; 
GLS.mouseup = function(evt) { 
var obj; 
var strlen; 
evt = (evt) ? evt : ((window.event) ? window.event : ""); 
if (evt) { 
obj = (evt.target) ? evt.target : evt.srcElement; 
strlen = window.getSelection ? window.getSelection().toString() : document.selection.createRange().text; 
} 
var str = ""; 
if (obj.tagName != "A" && obj.tagName != "INPUT" && obj == GLS.startObj && !GLS.isdb && GLS.allow) { 
if (strlen.length > 0) { 
str = strlen; 
} 
} 
GLS.search(str, evt); 
GLS.isdb = false; 
}; 
GLS.search = function(str, evt) { 
var obj = $("#GLSearch"); 
var sDivWidth = 88; //检索框“Google搜索”的宽度 
if (str.toString().length > 0) { 
var windowWidth; //窗口的宽 
//取得窗口的宽 
if (self.innerWidth) { 
windowWidth = self.innerWidth; 
} else if (document.documentElement && document.documentElement.clientWidth) { 
windowWidth = document.documentElement.clientWidth; 
} else if (document.body) { 
windowWidth = document.body.clientWidth; 
} 
obj.css({ 'display': 'block', 'position': 'absolute', 'zindex': '10000' }); 
var rX, rX, wT; 
if ($.browser.msie) { 
wT = (evt.clientX + sDivWidth) - windowWidth; 
rY = document.documentElement.scrollTop + evt.clientY; 
rX = document.documentElement.scrollLeft + evt.clientX; 
rY = (evt.clientY < 25) ? rY + 5 : rY - 25; 
rX = (wT > 0) ? rX - wT : rX + 5; 
} 
else { 
var sT = (document.documentElement.scrollTop > 0) ? document.documentElement.scrollTop : document.body.scrollTop; 
wT = (evt.pageX + sDivWidth) - windowWidth; 
rY = ((evt.pageY - sT) < 25) ? evt.pageY + 5 : evt.pageY - 25; 
rX = (wT > 0) ? evt.pageX - wT : evt.pageX + 5; 
} 
obj.css("top", rY); 
obj.css("left", rX); 
obj.html("<a class='GL_s' target='_blank' href='http://www.google.com/search?ie=UTF-8&oe=UTF-8&q=" + encodeURIComponent(str) + "'>Google搜索</a>"); 
} 
else { 
obj.css("display", "none"); 
} 
}; 

//页面加载 
$(document).ready(function() { 
$(document.body).append("<div id='GLSearch'></div>"); 
$(document).mousedown(GLS.mousedown).dblclick(GLS.dblclick).mouseup(GLS.mouseup); 
});------------附上CSS/*search*/ 
a.GL_s{width:68px;height:20px;display:block;border:solid 1px #2b7ab7;line-height:20px;padding-left:18px;color:#084f10;font-size:12px;font-weight:bold;background:url(search.gif) no-repeat left;text-decoration:none;} 
a.GL_s:link{filter:alpha(opacity=71);-moz-opacity:0.7;opacity: 0.7;} 
a.GL_s:hover{filter:alpha(opacity=100);-moz-opacity:1.0;opacity: 1.0;}----------search.gif图片