function formsubmit(form){

    if (form.chrName.value.length<1)
	{

        alert("请填入姓名");form.chrName.focus();return false;
	}
		
    if (form.chrEmail.value.length<1)
	{

        alert("请填入正确的E-mail");form.chrEmail.focus();return false;
	}

	if ((form.chrEmail.value).indexOf("@")<1||(form.chrEmail.value).indexOf(".")<3)
	{

        alert("请填入正确的E-mail");form.chrEmail.focus();return false;
	}
    
	if (form.chrSubject.value.length<1)
	{
        alert("请填入标题");form.chrSubject.focus();return false;
	}

    if (form.txtMessage.value.length<1)
	{

        alert("请填入留言信息");form.txtMessage.focus();return false;

    }

}