function checkFormValue(tamago){
    
    var text = '';
    var len = 0;
    var element_name = '';
    
    for(i=0; i<tamago.elements.length; i++){
        if(element_name == tamago.elements[i].name){
            continue;
        }
        
        switch (tamago.elements[i].type){
            
            // text
            case 'text' :
                len = tamago.elements[i].value.length;
                break;
            
            // textarea
            case 'textarea' :
                len = tamago.elements[i].value.length;
                break;
            
            // radio
            case 'radio' :
                var flag = false;
                for(j=0;j<tamago.elements[tamago.elements[i].name].length;j++){
                    //alert(tamago.elements[tamago.elements[i].name][j].checked);
                    if( tamago.elements[tamago.elements[i].name][j].checked == true ){
                        flag = true;
                    }
                }
                if(flag == false ){
                    len = 0;
                }else{
                    len = 1;
                }
                break;
                
            default:
                continue;
                break;
        }
        
        // tamago.elements[i].value
        //text += tamago.elements[i].name + " - " + tamago.elements[i].type + "(" + tamago.elements[i].value.length + ")\n";
        
        if(len==0){
            alert('ページの移動は入力後に行ってください。\n最後にも入力を修正できます。');
            return false;
        }
        element_name = tamago.elements[i].name;
    }
    //alert(text);
    return true;
}