IE7 Form Submit Doesn't Work

Hopefully someone will be able to point me in the right direction - I have a form and for some bizzare reason it doesn't su开发者_如何学Pythonbmit if the browser is IE7. IE8, 9, Chrome and Firefox all work without any issues so all I can think of is that it is using unsupported Javascript code. I think it's the line of code listed below.

$("#form_3next").click(function(){
$("#form_3action").val('next');
});
$("#form_3back").click(function(){
$("#form_3action").val('back');
});
$("#form_3finished").click(function(){
$("#form_3action").val('finished');
});

Here's a working example - http://www.bristolstreet.co.uk/contact-us/ any help would be greatly appreciated...

Best Wishes Rachel

I looked through your page and I could not find "form_3next" or "form_3back". Maybe that's a problem (IE can break from the stupidest problems)...