var axu_url1280="css/1280.css";   //设置变量axu_url800x600    样式：1.css
var axu_url1152="css/1152.css";
var axu_url1024x768="css/1024.css";  //设置变量axu_url1024x768   样式：2.css
if(screen.width==1280) 
document.getElementById("skin").href=axu_url1280;   //判断分辨率是1800x600调用1.css

else if((screen.width==1024)&&(screen.height==768))  
document.getElementById("skin").href=axu_url1024x768;  //判断分辨率是1024x768调用2.css

else if(screen.width==1152)  
document.getElementById("skin").href=axu_url1152;

else document.getElementById("skin").href=axu_url1280;  //否则 调用2.css