/**
 * ajax无刷新二级联动下拉菜单(省市联动)
 *
 * @author      arcow <arcow@126.com>
 * @version     1.0
 * @lastupdate  2005-12-29
 *
 */
	function addOption(objSelectNow,txt,val)
	{
		/// 使用W3C标准语法为SELECT添加Option
		var objOption = document.createElement("OPTION");
		objOption.text= txt;
		objOption.value=val;
		objSelectNow.options.add(objOption);
	}
	function addOptionGroup(selectId,optGroupString)
	{
		var optGroup = optGroupString.split(",");
        var tgroup;
		var opt;
		var objSelect = document.getElementsByTagName("SELECT");
		var objSelectNow = objSelect[selectId];
		 
	    /// 成组添加Options
		for (i=0; i<optGroup.length; i++)
		{
			tgroup=optGroup[i];
		    opt = tgroup.split("||");
			addOption(objSelectNow, opt[0], opt[1]);
		}
	}