Viewcart will not proceed to Checkout or Continue Shopping

I'm really pulling my hair out now! I have a checkout process that is pretty much functional, (I have a couple of open threads on specific issues) but for the most part everything was working like it should be.

Then I started working on adding a dropdown to the checkout page for the customer to choose a shipping service (express, ground...). I read how to do it on one of the threads here, and did all of the steps described, then was ready to test it. So I went to my site, added a product to the cart, clicked Checkout... Nothing happens! I click Continue Shopping... Nothing Happens!

I tried removing the Checkout button and adding it again from the Server Behaviors, not any better.

I went to the checkout.php page to see where the "getContent" and "eCart Redirect" were, they seemed fine, I tried them in different places... no better, I restored the files from time machine, still no better, I restored the complete site directory as it was yesterday (when everything except some custom features worked fine). Still the same result! If I access checkout.php directly by typing it into the address bar, I can go there and checkout fine!

Any insight would be VERY MUCH appreciated.

P.S.
I have attached my viewcart.php and checkout.php pages, if that will help.

add the following code at line 102, just before the doctype tag:

<?php

// WA eCart Redirect

if ($eCart1->redirStr != "")     {

  header("Location: ".$eCart1->redirStr);

}

?>

I'm assuming that you're talking about adding that to the checkout.php page? That code was already in there - a few lines up. I went ahead and put it in like you suggested, but it didn't make any difference. :-(

Thanks for your time.

No, not on the checkout page, on the view cart page.

I put that in the viewcart page, and it did the trick!
Thanks a million!

you're welcome.