my_form_default_value = new Object();

function doclear(target, default_value) {
	if(target.type != "text"){
		return;
	}
	if(target.value == default_value){
		target.value = "";
	}
	var target_name = target.name;
	my_form_default_value[target_name] = default_value;
}

function put_value(target){
	if(target.value != ""){
		return;
	}
	var target_name = target.name;
	if(my_form_default_value[target_name]){
		target.value = my_form_default_value[target_name];
	}
}