I am building a new order form based on JavaScript/Ajax. Everything works fine in IE but Firefox seems to screw things up. On Firefox Java script stops running in this function, I don't know why:

1: function doProceedWithOrder()
2: {
3: document.getElementById('loading').style.display = '';
4: document.getElementById('load_text').innerHTML = "Processing your request, please wait.";
5: document.getElementById('domain_result').innerHTML = '';
6: document.getElementById('domainandtld').value = document.getElementById('domain').value + document.getElementById('tld').value;
7: document.getElementById('plan_domain').innerHTML = document.getElementById('domainandtld').value;
8: updateSession_domain();
9: }

More precise it stops on line 6. Any ideeas?

What's the exact error you're getting?