function check(){
	if(document.forms[0].email.value == ""){
		alert("e-mailのデータが空白です");
		document.forms[0].email.focus();
		return false;
	}
	if(document.forms[0].email.value == document.forms[0].email_.value){
		return true;
	}else{
		alert("e-mailの内容が不一致です");
		document.forms[0].email.focus();
		return false;
	}
}