var NUM = "0123456789"; 
var SALPHA = "abcdefghijklmnopqrstuvwxyz";
var ALPHA = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"+SALPHA;
var code = ",-";

function TypeCheck (s, spc)
{
	var i;
	for(i=0; i< s.length; i++)
	{
		if (spc.indexOf(s.substring(i, i+1)) < 0)
		{
			return false;
		}
	}        
	return true;
}

function email_isok(str)
{
reg = new RegExp("^([_a-z0-9]+([\._a-z0-9-]+)*)@([a-z0-9]{2,}(\.[a-z0-9-]{2,})*\.[a-z]{2,3})$");
if (!reg.test(str)) {
  alert('邮件地址不合法！');
  return (false);
}
return(true);
}

function check1(){
	result = true;
	for (var i=0;i<4;i++){
		if (form1.sel_1[i].checked){
			result = false;
		}
	}
	if (result){
		alert("请您选择第一题！");
		form1.sel_1[0].focus()
		return false;
	}

	result = true;
	for (var i=0;i<2;i++){
		if (form1.sel_2[i].checked){
			result = false;
		}
	}
	if (result){
		alert("请您选择第二题！");
		form1.sel_2[0].focus()
		return false;
	}

	result = true;
	for (var i=0;i<3;i++){
		if (form1.sel_3[i].checked){
			result = false;
		}
	}
	if (result){
		alert("请您选择第三题！");
		form1.sel_3[0].focus()
		return false;
	}

	result = true;
	for (var i=0;i<3;i++){
		if (form1.sel_4[i].checked){
			result = false;
		}
	}
	if (result){
		alert("请您选择第四题！");
		form1.sel_4[0].focus()
		return false;
	}

	result = true;
}

function check2(){
/*	if (form2.name.value==""){
		alert("请输入姓名！");
		form2.name.focus()
		return false;
	}
	if (form2.tel.value==""){
		alert("请输入电话号码！");
		form2.tel.focus()
		return false;
	}
	if (!TypeCheck(form2.tel.value, NUM+code)){
		alert("请正确填写联系电话，分机用 - 隔开！");
		form2.tel.focus();
		return false;
	}*/
	if (form2.mail.value==""){
		alert("请输入E-mail地址！");
		form2.mail.focus()
		return false;
	}
	if (!email_isok(form2.mail.value)){
		form2.mail.focus();
		return (false);
	}  
	result = true;
}

function check3(){
	if (form3.name.value==""){
		alert("请输入姓名！");
		form3.name.focus()
		return false;
	}
	if (form3.tel.value==""){
		alert("请输入电话号码！");
		form3.tel.focus()
		return false;
	}
	if (!TypeCheck(form3.tel.value, NUM+code)){
		alert("请正确填写联系电话，分机用 - 隔开！");
		form3.tel.focus();
		return false;
	}
	if (form3.mail.value==""){
		alert("请输入E-mail地址！");
		form3.mail.focus()
		return false;
	}
	if (!email_isok(form3.mail.value)){
		form3.mail.focus();
		return (false);
	}  
	result = true;
}


function check4(){
	if (form4.name.value==""){
		alert("请输入姓名！");
		form4.name.focus()
		return false;
	}
	if (form4.company.value==""){
		alert("请输入单位！");
		form4.company.focus()
		return false;
	}
	if (form4.headship.value==""){
		alert("请输入职务！");
		form4.headship.focus()
		return false;
	}
	if (form4.mail.value==""){
		alert("请输入E-mail地址！");
		form4.mail.focus()
		return false;
	}
	if (!email_isok(form4.mail.value)){
		form4.mail.focus();
		return (false);
	}  
	if (form4.site.value==""){
		alert("请选择您要参加的场次！");
		form4.site.focus()
		return false;
	}
	result = true;
}