//验证邮箱输入
function checkTopEmail(){
	var email=document.getElementById("sendEmail").value;
	if(email != ""){
		var emailOk = checkEmail(email);
		if(!emailOk){
			alert("对不起，您输入的邮箱格式不正确！");
			document.addPrizeEmail.email.focus();
			return false;
		}else{
			return true;
		}
	}else{
		alert("对不起，请输入您的邮箱！");
		document.addPrizeEmail.email.focus();
		return false;
	}
}

//验证邮箱格式
function checkEmail(str) {
	if (str.search(/^\w+((-\w+)|(\.\w+))*\@[A-Za-z0-9]+((\.|-)[A-Za-z0-9]+)*\.[A-Za-z0-9]+$/) != -1){
		return true;
	}else{
		return false;
	}
}

function claerValue(){
	document.getElementById("sendEmail").value = "";
}