ทำยังไงให้ javascript Validate form บน Firefox ได้ แถมเรื่อง Captcha ด้วยครับ

function Validate_Register()
{
	var reg = /^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})$/;
	var address = document.form2.E_Mail.value;
	
	if(document.form2.User.value == "")
	{
		alert("Please Input Username");
		document.form2.User.focus();
		return false;
	}
	
	if(document.form2.Password1.value.length < 6)
	{
		alert("Password Minimum is 6 Character");
		document.form2.Password1.focus();
		return false;
	}
	
	if(document.form2.Password1.value != form2.Password2.value)
	{		
		alert("Password Confirm not Match");
		return false;
	}

	if(document.form2.Name.value == "")
	{
		alert("Please Input First Name");
		document.form2.Name.focus();
		return false;
	}
	
	if(document.form2.L_Name.value == "")
	{
		alert("Please Input Last Name");
		document.form2.L_Name.focus();
		return false;
	}
	
	if(document.form2.Address.value == "")
	{
		alert("Please Input Address");
		document.form2.Address.focus();
		return false;
	}
	
	if(document.form2.Tel.value == "")
	{
		alert("Please Input Telephone");
		document.form2.Tel.focus();
		return false;
	}
	
	if(document.form2.Mtel.value == "")
	{
		alert("Please Input Mobile Phone");
		document.form2.Mtel.focus();
		return false;
	}
	
	if(document.form2.Country.value == "")
	{
		alert("Please Input Country");
		document.form2.Country.focus();
		return false;
	}
	
	if(document.form2.Zip_Code.value == "")
	{
		alert("Please Input Zip Code");
		document.form2.Zip_Code.focus();
		return false;
	}
	
	if(document.form2.Mtel.value == "")
	{
		alert("Please Input Mobile Phone");
		document.form2.Mtel.focus();
		return false;
	}
	
	if(document.form2.E_Mail.value == "")
	{
		alert("Please Input E_Mail");
		document.form2.E_Mail.focus();
		return false;
	}
	
	if(reg.test(address) == false)
	{	
		alert("Invalid Email Address");
      	document.form2.E_Mail.focus();
		return false;
	}
	
	if(document.form2.security_code.value == "")
	{
		alert("Please Input Security Code");
		document.form2.security_code.focus();
		return false;
	}
	
	if(document.form2.box.checked == false)
	{
		alert("Please Agree Rule");
		document.form2.box.focus();
		return false;
	}
	
	//else
	//{
		//alert("OK");
		//return false;
	//}
}