[Resolved] javascript and php

[JLW]

I am working with a form that returns a value to a textbox (gets a rate from ups and returns the value), using a javascript function. I have php variables that I am posting from the previous page. So here is what I am trying to do.
After the rate is returned I want to multiply the rate by a value passed in by php and have it returned to a separate text box. The problem is that I don't have a lot of experience with javascript. Here is the function that returns a value:

function set_rate(rate)
{

document.checkout.elements['rate'].value = rate;
document.checkout.elements['show_rate'].value = rate;
}

But I need to know how to pass in the php variable mulitply it by rate and have that value returned to another textbox.

[JLW]

I figured it out, it was easier than I thought:

function set_rate(rate, Quantity) 
{ 

document.checkout.elements['rate'].value = rate; 
document.checkout.elements['show_rate'].value = rate; 

Quantity = '<?php echo $NumberOfSigns; ?>';
rate2 = Quantity * rate;
document.checkout.elements['final_rate'].value = rate2;
}