根据浏览器和分辨率调用CSS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)
{
file://如果浏览器为Firefox
var Firefox1024="";
var Firefox800="";
var Firefox1152="";
var Firefoxother="";

ScreenWidth(Firefox1024,Firefox800,Firefox1152,Firefoxother)
}else{
file://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) && (screen.height == 768)){
setActiveStyleSheet(CSS1);
}else{
if ((screen.width == 800) && (screen.height == 600)){
setActiveStyleSheet(CSS2);
}else{
if ((screen.width == 1152) && (screen.height == 864)){
setActiveStyleSheet(CSS3);
}else{
setActiveStyleSheet(CSS4);
}}}
}

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

var IE1024="";
var IE800="";
var IE1152="";
var IEother="";

var Firefox1024="";
var Firefox800="";
var Firefox1152="";
var Firefoxother="";

var Other1024="";
var Other800="";
var Other1152="";
var Otherother="";

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

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