function check(){
if(window.navigator.userAgent.indexOf("MSIE 8.0")>=1){
//如果浏览器为IE 8.0
alert("ie8");
//
setActiveStyleSheet("css/index00.css");

}
else if(window.navigator.userAgent.indexOf("MSIE 7.0")>=1){
//如果浏览器为IE 7.0
//alert("../css/index00.css");
setActiveStyleSheet("css/index00.css");//设置css样式表
}
else if(window.navigator.userAgent.indexOf("TencentTraveler")>=1){
//如果浏览器为腾讯TT
//alert("浏览器为腾讯TT");
setActiveStyleSheet("css/indexIE6.css");
}
else if(window.navigator.userAgent.indexOf("Maxthon")>=1){
//如果浏览器为傲游
//alert("ie6");
setActiveStyleSheet("css/indexIE6.css");
}
else if(window.navigator.userAgent.indexOf("MSIE 6.0")>=1){
//如果浏览器为IE 6.0
//alert("ie6");
setActiveStyleSheet("css/indexIE6.css");
}
else if(window.navigator.userAgent.indexOf("Firefox")>=1){
//如果浏览器为Firefox
setActiveStyleSheet("css/index00.css");
}
else if(window.navigator.userAgent.indexOf("Safari")>=1){
//如果浏览器为Safari
setActiveStyleSheet("Safari_index_layout.css");
}
else if(window.navigator.appName=="Opera"){
//如果浏览器为Opera
setActiveStyleSheet("Opera_index_layout.css");
}
else{
//如果浏览器为其它
setActiveStyleSheet("css/indexIE6.css");
}
}

function setActiveStyleSheet(title){ 
document.getElementsByTagName("LINK")[1].href=title; 
//alert(document.getElementsByTagName("LINK")[0].href);
}