if (window.navigator.userAgent.indexOf("MSIE")>=1)
{
	var IE1024="style2.css";
	var IE800="style2.css";
	var IE1152="style2.css";
	var IEother="style2.css";
	
	ScreenWidth(IE1024,IE800,IE1152,IEother);

}else{
if (window.navigator.userAgent.indexOf("Firefox")>=1)
	{
	//如果浏览器为Firefox
	var Firefox1024="style2.css";
	var Firefox800="style2.css";
	var Firefox1152="style2.css";
	var Firefoxother="style2.css";

	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) && (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="css/"+title; 
}