function doChange(checked)
{
	var total=$('total').value;
	for (var i=0;i<total;i++)
	{
		$('check'+i).checked=false;
		$('check'+i).disabled=checked;
	}
}

function checkSubmit()
{
	alert "go";
	var error="";
	var total=$('total').value;
	var checked=false;
	for (var i=0;i<total;i++)
	{
		if($('check'+i).checked) checked=true;
	}
	checked=checked||$('all').checked;
	if (!checked) error+="\n Please select at least 1 product";
	if ($('email').value=="") 
		{
			error+="\n Please enter your email";
		}
		else
		{
			if ($('email').value!=$('email1').value)  error+="\n Please confirm your email";
		}
   if ($('code').value=="") error+="\n Please enter your product Product ID";
   if (error!="") 
   	{
   		alert(error);
   		return false;
   	}
   return true;
}
function checkPay()
{
	if (!$('confirm').checked)
	{
		alert('Please confirm');
		return false;
	}
	return true;
}

function checkPid()
{
	if (!$('confirm').checked)
	{
		alert('Please confirm');
		return false;
	}
	return true;
}