function $(str){

	return document.getElementById(str);

}



function $_(str){

	return document.getElementsByName(str);

}



function CheckRadio(obj){

	o = $_(obj);

	p = false;

	for(i = 0;i < o.length;i ++){

		if (o[i].checked)

		{

			p = true;

			break;

		}

	}

	return p;

}

function GetRadioValue(obj){

	o = $_(obj);

	for(i = 0;i < o.length;i ++){

		if (o[i].checked)

		{

			myvalue = o[i].value;

			break;

		}

	}

	return myvalue;

}

function GetCheckboxValue(obj){

	o = $_(obj);

	var myvalue = '';

	for(i = 0;i < o.length;i ++){

		if (o[i].checked)

		{

			myvalue += o[i].value + ",";

		}

	}

	return myvalue.substring(0,myvalue.length-1);

}

function CheckBoxValue(obj,value){
	var objvalue = "," + GetCheckboxValue(obj) + ",";
	var value = "," + value + ",";
	if(objvalue.indexOf(value) > -1)
		return 1;
	else
		return 0;
}
function RadioBoxValue(obj,value){
	var objvalue = "," + GetRadioValue(obj) + ",";
	var value = "," + value + ",";
	if(objvalue.indexOf(value) > -1)
		return 1;
	else
		return 0;
}

function CheckInput(obj){

	if($(obj).value == ""){

		return false;

	}

	return true;

}

function input(obj){

	if($(obj).value == ""){

		return false;

	}

	return true;

}



function checkweeklyleft(){

	if($("textfield").value == ""){

		alert("请输入您的邮件地址");

		return false;

	}
	if($("textfield").value != "")
	{
		var a=$("textfield").value;
		var emailPat=/^(([0-9a-zA-Z]+)|([0-9a-zA-Z]+[_.0-9a-zA-Z-]*[_.0-9a-zA-Z]+))@([a-zA-Z0-9-]+[.])+([a-zA-Z]{2}|net|NET|com|COM|gov|GOV|mil|MIL|org|ORG|edu|EDU|int|INT)$/;  
	var matchArray=a.match(emailPat);
	if (matchArray==null) {
		alert ("电子邮件格式无效");
		return false;
	}
	}
	var answer= document.getElementsByName("zhoukan[]");

 var flag = false;

 for(var i=0;i<answer.length;i++){

  if(answer[i].checked == true){

   flag = true;

   break;

  }

 }

 if(!flag){

  alert("请选择要订阅的周刊");

		return false;

 }
}


function replace(str,str0,str1){
	if(str.indexOf(str0) >= 0){
		str = str.replace(str0, str1);
	}
	return str;
}
function change(obj,intstr){
	var obja = document.getElementById(obj);
	var objb = obja.getElementsByTagName("li");
	var objlen = objb.length;
	//
	for(var i = 0;i < objlen;i++){
		objb[i].className = "";
	}
	for(var j = 0;j < intstr;j++){
		objb[j].className = "crr";
	}
}
function clicker(obj,intstr,value){
	document.getElementById(obj + "_checked").value = intstr;
	objid = replace(obj,"_div","");
	document.getElementById(objid).value = value;
	checked(obj,intstr);
}
function checked(obj,intstr){
	var values = document.getElementById(obj + "_checked").value;
	var obja = document.getElementById(obj);
	var objb = obja.getElementsByTagName("li");
	var objlen = objb.length;
	for(var i = 0;i < objlen;i++){
		objb[i].className = "";
	}
	for(var m = 0;m < values;m++){
		objb[m].className = "checked";
	}
}