function isEmail(vEMail)
{
	var regInvalid=/(@.*@)|(\.\.)|(@\.)|(\.@)|(^\.)/;
	var regValid=/^.+\@(\[?)[a-zA-Z0-9\-\.]+\.([a-zA-Z]{2,3}|[0-9]{1,3})(\]?)$/;
	return (!regInvalid.test(vEMail)&&regValid.test(vEMail));
}
function check()
{

	if (document.submitform.Username.value==""){
		alert("联系人必须填写！");
		document.submitform.Username.focus();
		return false;
	}
	if (document.submitform.tel.value=="")
	{
		alert("联系电话必须填写！");
		document.submitform.tel.focus();
		return false;
	}
  	if (document.submitform.company.value==""){
		alert("公司名称必须填写！");
		document.submitform.company.focus();
		return false;
	}
	document.submitform.submit();
}