document.getElementsByName返回的是个数组

记住这个返回的是个数组document.getElementsByName.
取radio的值就这样取
l=document.getElementsByName("sitesearch");
                for(i=0;i<l.length;i++) 
                { 
                    if(l[i].checked) 
                    {        
                        ...........................
                     }                    
                                            
                }