// JavaScript Document

function KiemTraEmail()
{
    if(trim(document.frmEmail.txtEmail.value) == "")
	{
		alert("Email is not empty");
		document.frmEmail.txtEmail.focus();
		return false;
	}
	if( !isEmail(document.frmEmail.txtEmail.value) )
	{
		alert("Email is not valid");
		document.frmEmail.txtEmail.focus();
		document.frmEmail.txtEmail.select();
		return false;
	} 

	return true;
}
function isEmail(emailstr)
{
	dotchar = emailstr.indexOf(".");
	atchar = emailstr.indexOf("@");
	dotlast = emailstr.lastIndexOf(".");
	spacechar = emailstr.indexOf(" ");
	len = emailstr.length;
	if( (dotchar == -1) || (atchar == -1) || (spacechar != -1) || (dotlast < atchar) || (dotlast == len - 1) )
	{
		return false;
	}
	else
	{
		return true;
	}
}
function trim(str)
{
ch = '';
for(i=0;i<str.length;i++)
{
	cha = str.charAt(i);
	if(cha != ' ')
	{
		ch = ch + cha;
	}
}
return ch;
}
function verify()
{   if(trim(document.frmDatPhong.firstname.value) == "")
	{
		alert("Your first name is not empty");
		document.frmDatPhong.firstname.focus();
		return false;
	}
	if(trim(document.frmDatPhong.lastname.value) == "")
	{
		alert("Your last name is not last name");
		document.frmDatPhong.lastname.focus();
		return false;
	}
	if(trim(document.frmDatPhong.national.value) == "")
	{
		alert("National is not empty");
		document.frmDatPhong.national.focus();
		return false;
	}
	if(trim(document.frmDatPhong.phone.value) == "")
	{
		alert("Your phone is not empty");
		document.frmDatPhong.phone.focus();
		return false;
	}
	
    if(trim(document.frmDatPhong.email.value) == "")
	{
		alert("Email is not empty");
		document.frmDatPhong.email.focus();
		return false;
	}
	if( !isEmail(document.frmDatPhong.email.value) )
	{
		alert("Email is not valid");
		document.frmDatPhong.email.focus();
		document.frmDatPhong.email.select();
		return false;
	} 
    if(trim(document.frmDatPhong.service.value) == "")
	{
		alert("Service request is not empty");
		document.frmDatPhong.service.focus();
		return false;
	}
	return true;
}