function show_qsec(t){
    
    if(t==1){
        s=2;
    }else{
        s=1;
    }
    
    document.getElementById('q_container'+t).style.display = 'block';
    
    document.getElementById('q_container'+s).style.display = 'none';
    var rad = document.getElementById('q_container'+s).getElementsByTagName('input');//all inputs are radio
    len = rad.length;
    for(i=0;i<len;i++){
        rad[i].checked='';
    }
    
    document.getElementById('goto').value=t;
    
}

function chkrad(){
    var f1 = document.getElementById('form1');
    var inputs = f1.getElementsByTagName('input');
    var len = inputs.length;
    var chked=0;
    for(i=0;i<len;i++){
        if(inputs[i].type=='radio'){
            if(inputs[i].checked){
                chked++;
            }
        }
    }
    if(chked<8){
        alert('請依序填完8個檢測題目。');
        return;
    }else{
        f1.submit();
        return true;
    }
}
 
window.onload = function(){
    document.getElementById('goto').value=1;
    document.getElementById('q_container1').style.display='block';
    document.getElementById('q_container2').style.display='none';
}