function submitForm()
	{	
		if(document.form_seminar.name.value=="")
		{
			alert("請輸入姓名.");
			document.form_seminar.name.focus();
			return false;		
		}
		
		var rel=false;
		for(var i=0;i<document.form_seminar.sex.length;i++)
		{
			if(document.form_seminar.sex[i].checked)
			{
			   rel=true;
			}
		}
		if(!rel)
		{
			alert("請選擇性別.");
			return false; 
		}
		if(document.form_seminar.tel.value=="")
		{
			alert("請輸入聯絡電話.");
			document.form_seminar.tel.focus();
			return false;		
		}
		
		if(document.form_seminar.email.value=="")
		{
			alert("請輸入電郵地址.");
			document.form_seminar.email.focus();
			return false;		
		}
		
		if( (document.form_seminar.email.value != "") && ((document.form_seminar.email.value.indexOf('@') < 0) || ((document.form_seminar.email.value.charAt(document.form_seminar.email.value.length-4) != '.') && (document.form_seminar.email.value.charAt(document.form_seminar.email.value.length-3) != '.'))))
		{
			alert("請輸入有效的電郵.");
			document.form_seminar.email.focus();
			return false;		
		}
		
		document.form_seminar.submit();
		return false;
	}