根据判断浏览器类型屏幕分辨率自动调用不同CSS的代码

<SCRIPT LANGUAGE="JavaScript">
<!--
if (window.navigator.userAgent.indexOf("MSIE")>=1)
{
var IE1024="";
var IE800="";
var IE1152="";
var IEother="";

ScreenWidth(IE1024,IE800,IE1152,IEother)
}else{
if (window.navigator.userAgent.indexOf("Firefox")>=1)
{
//如果浏览器为Firefox
var Firefox1024="";
var Firefox800="";
var Firefox1152="";
var Firefoxother="";

ScreenWidth(Firefox1024,Firefox800,Firefox1152,Firefoxother)
}else{
//如果浏览器为其他
var Other1024="";
var Other800="";
var Other1152="";
var Otherother="";
ScreenWidth(Other1024,Other800,Other1152,Otherother)
}
}

function ScreenWidth(CSS1,CSS2,CSS3,CSS4){
if ((screen.width == 1024) &amp;&amp; (screen.height == 768)){
setActiveStyleSheet(CSS1);
}else{
if ((screen.width == 800) &amp;&amp; (screen.height == 600)){
setActiveStyleSheet(CSS2);
}else{
if ((screen.width == 1152) &amp;&amp; (screen.height == 864)){
setActiveStyleSheet(CSS3);
}else{
setActiveStyleSheet(CSS4);
}}}
}

function setActiveStyleSheet(title){ 
 document.getElementsByTagName("link")[0].href="style/"+title; 
}
//-->
</SCRIPT>

<SCRIPT LANGUAGE="JavaScript">
<!--
if (window.navigator.userAgent.indexOf("MSIE")>=1)
{
//如果浏览器为IE
setActiveStyleSheet("default.css");
}else{
if (window.navigator.userAgent.indexOf("Firefox")>=1)
{
//如果浏览器为Firefox
setActiveStyleSheet("default2.css");
}else{
//如果浏览器为其他
setActiveStyleSheet("newsky.css");
}
}

function setActiveStyleSheet(title){ 
 document.getElementsByTagName("link")[0].href="style/"+title; 
}
//-->
</SCRIPT>

<script language=javascript> 
<!--
if (screen.width == 800)
{
document.write('<link rel=stylesheet type="text/css" href="css800.css">')
}
else {document.write('<link rel=stylesheet type="text/css" href="css1024.css">')}
//-->
</script>