function CheckForm2() 
{ 
//mac地址正則表達式 
var reg_name=/[A-F/d]{2}:[A-F/d]{2}:[A-F/d]{2}:[A-F/d]{2}:[A-F/d]{2}:[A-F/d]{2}/; 
if(!reg_name.test(document.form2.mac.value)){ 
alert("mac地址格式不正確！mac地址格式為00:24:21:19:BD:E4"); 
document.form2.mac.focus(); 
return false; 
} 
return true; 
}