function check(){
        if(!trim(form.id.value)){alert('．請輸入帳號');form.id.focus();return false;}
        if(!ischar(form.id.value)){form.id.select();return false;}
        if(!trim(form.pw.value)){alert('．請輸入密碼');form.pw.focus();return false;}
        if(!ischar(form.pw.value)){form.pw.select();return false;}
        form.submit();
}
function ischar(s){
        var errorChar;
        var badChar = "><[]{}?/\+=|'~!#$%^&()`"; 

        errorChar = isCharsInBagEx(s,badChar);
        if (errorChar != ''){
                alert('．請勿輸入特殊字元('+ badChar +')');
                return false;
        }
        return true;
}
function isCharsInBagEx(s,bag){ 
        var i,c;
        for (i = 0; i < s.length; i++){ 
                c = s.charAt(i);
                if (bag.indexOf(c) > -1){
                return c
                }
        }
        return '';
}
function trim(instr){
        return instr.replace(/^[\s]*/gi,'').replace(/[\s]*$/gi,'');
}