function IsValidEmailAddr(sAddr){
	var fRes = false;
	var nPos;
	if( sAddr.length > 5 ){
		nPos = sAddr.indexOf("@");
		if( nPos >= 0 ){
			++nPos;
			if( sAddr.indexOf("@", nPos) < 0 ){ 
				nPos = sAddr.indexOf(".", nPos);
				if( (nPos > 0) && ( nPos+2 < sAddr.length ) )
					fRes = true;
			}
		}
	}
	return fRes;
}

function ValidateForm(oForm){

	var fRes = false;
	if (oForm.FirstName.value.length < 1 )
	{
		alert("Please your enter your first name");
		oForm.FirstName.focus();
	}
	else{
		fRes = IsValidEmailAddr(oForm.Email.value);
		if( fRes == false ){
			 alert("Please enter a valid email address.");
			 oForm.Email.focus();
		}
	}
	return fRes;
}