function init_parentOptions(set_select) {

	var select = document.getElementById(set_select);
	select.options.length = eval(set_select).length;
	for (var i = 0; i < eval(set_select).length; i++) {
		select.options[i].value = eval(set_select)[i][1];
		select.options[i].text = eval(set_select)[i][0];
	}
}

function change_childoneOptions(parantOptionsID,childOneOptionsID,currentValue){
	 
	document.getElementById(parantOptionsID).focus();
	try{
		//将参数parantOptionsID和childOneOptionsID转换成对应的下拉框
		var select1 = document.getElementById(parantOptionsID);
		var select2 = document.getElementById(childOneOptionsID);
		 
		select1.options.length = eval(parantOptionsID+currentValue).length;
		 
		for (var i = 0; i < eval(parantOptionsID+currentValue).length; i++) {
			
			select1.options[i].value = eval(parantOptionsID+currentValue)[i][1];
			select1.options[i].text = eval(parantOptionsID+currentValue)[i][0];  
		} 

		select1.options[0].selected="true";

		//数组中不存在对应的值
		if (eval(parantOptionsID+currentValue).length == 0) {
			select1.options.length = 0;
			return false;
		}else{
		
			change_childLastOptions(childOneOptionsID,select1.options[0].value);  
		} 
	}catch(e){
		document.getElementById(parantOptionsID).options.length = 0; 
		document.getElementById(childOneOptionsID).options.length = 0;
	}
}


function change_childLastOptions(childLastSelectID, currentValue) {
 
	try{ 
		var select1 = document.getElementById(childLastSelectID);  
		var len = eval(childLastSelectID+currentValue).length;
 
		//循环对应数组，查找对应的值，放如下拉框中 
		select1.options.length = len;
	 
		for (var i = 0; i < len; i++) {

			select1.options[i].value = eval(childLastSelectID+currentValue)[i][1];
			select1.options[i].text = eval(childLastSelectID+currentValue)[i][0];  
		}

		//数组中不存在对应的值
		if (len == 0) {
			select1.options.length = 0;
			return false;
		}
	}catch(e){
		document.getElementById(childLastSelectID).options.length = 0; 
	} 
}