var system ={  
win : false,  
mac : false,  
xll : false  
};  
var p = navigator.platform;  
system.win = p.indexOf("Win") == 0;
system.mac = p.indexOf("Mac") == 0;  
system.x11 = (p == "X11") || (p.indexOf("Linux") == 0); 
if(system.win||system.mac||system.xll){  
}else{  
window.location.href="m/index.asp";  
}  
