function CheckBox(Obj,ID)
{
    if(Obj.getElementsByTagName('input')[0].value) {
	Obj.getElementsByTagName('img')[0].className = "";
	Obj.getElementsByTagName('input')[0].value = "";
    } else {
	Obj.getElementsByTagName('img')[0].className = "checked";
	Obj.getElementsByTagName('input')[0].value = ID;
    }
}